diff --git a/nrf_802154/doc/CHANGELOG.rst b/nrf_802154/doc/CHANGELOG.rst
index a17907915b..89bc37d560 100644
--- a/nrf_802154/doc/CHANGELOG.rst
+++ b/nrf_802154/doc/CHANGELOG.rst
@@ -10,6 +10,14 @@ Changelog
 All notable changes to this project are documented in this file.
 See also :ref:`nrf_802154_limitations` for permanent limitations.
 
+Main branch - nRF 802.15.4 Radio Driver
+***************************************
+
+Bug fixes
+=========
+
+* Fixed an issue causing the driver to report a very inaccurate timestamp if a delayed operation starts shortly after sleep request. (KRKNWK-18589)
+
 nRF Connect SDK v2.6.0 - nRF 802.15.4 Radio Driver
 **************************************************
 
diff --git a/nrf_802154/driver/src/nrf_802154_aes_ccm_acc_ecb.c b/nrf_802154/driver/src/nrf_802154_aes_ccm_acc_ecb.c
index eb96628629..c79b20fc2a 100644
--- a/nrf_802154/driver/src/nrf_802154_aes_ccm_acc_ecb.c
+++ b/nrf_802154/driver/src/nrf_802154_aes_ccm_acc_ecb.c
@@ -44,7 +44,11 @@
 #include "nrf_802154_const.h"
 #include "nrf_802154_config.h"
 #include "nrf_802154_tx_work_buffer.h"
-#include "nrf_802154_sl_ecb.h"
+#if defined(CONFIG_MPSL)
+#include "mpsl_ecb.h"
+#else
+#include "hal/nrf_ecb.h"
+#endif
 
 #ifndef MIN
 #define MIN(a, b)                                 ((a) < (b) ? (a) : (b)) ///< Leaves the minimum of the two arguments
@@ -62,14 +66,6 @@
 #define NRF_802154_AES_CCM_AUTH_DATA_LENGTH_OCTET 0                       // AnnnexB4.1.1b) - Position of octet for length of auth data in AddAuthData
 #define NRF_802154_AES_CCM_AUTH_DATA_OCTET        2                       // AnnnexB4.1.1b) - Position of octet for data of auth data in AddAuthData
 
-#if NRF_802154_AES_CCM_BLOCK_SIZE != NRF_802154_SL_ECB_CLEARTEXT_LENGTH
-#error NRF_802154_AES_CCM_BLOCK_SIZE != NRF_802154_SL_ECB_CLEARTEXT_LENGTH
-#endif
-
-#if NRF_802154_AES_CCM_BLOCK_SIZE != NRF_802154_SL_ECB_CIPHERTEXT_LENGTH
-#error NRF_802154_AES_CCM_BLOCK_SIZE != NRF_802154_SL_ECB_CLEARTEXT_LENGTH
-#endif
-
 /**
  * @brief Steps of AES-CCM* algorithm.
  */
@@ -102,12 +98,98 @@ static uint8_t                 * mp_work_buffer;
 
 static const uint8_t m_mic_size[] = { 0, MIC_32_SIZE, MIC_64_SIZE, MIC_128_SIZE }; ///< Security level - 802.15.4-2015 Standard Table 9.6
 
+typedef struct
+{
+    uint32_t key[NRF_802154_AES_CCM_BLOCK_SIZE / sizeof(uint32_t)];
+    uint8_t  cleartext[NRF_802154_AES_CCM_BLOCK_SIZE];
+    uint8_t  ciphertext[NRF_802154_AES_CCM_BLOCK_SIZE];
+} nrf_802154_hal_ecb_data_t;
+
 /******************************************************************************/
 /******************************************************************************/
 /******************************************************************************/
 
-static nrf_802154_sl_ecb_data_t m_ecb_hal_data;
-static bool                     m_ecb_hal_req_run;
+static nrf_802154_hal_ecb_data_t m_ecb_hal_data;
+static bool                      m_ecb_hal_req_run;
+
+#if defined(CONFIG_MPSL)
+static inline void ecb_block_encrypt(nrf_802154_hal_ecb_data_t * p_ecb_data)
+{
+    /* Note: nrf_802154_hal_ecb_data_t and mpsl_ecb_hal_data_t are equivalent
+     * and pointers to them can be safely cast.
+     */
+    mpsl_ecb_block_encrypt((mpsl_ecb_hal_data_t *)p_ecb_data);
+}
+
+#else
+
+#define ECB_INST NRF_ECB
+
+static inline void sleep_wfe(void)
+{
+#if defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
+    void z_impl_k_busy_wait();
+    z_impl_k_busy_wait(10);
+#elif defined(CONFIG_SOC_COMPATIBLE_NRF52X)
+    __WFE();
+#else
+    /* Do-nothing. This includes nRF5340 series due multiple sleep-related anomalies (160, 165, 168) */
+#endif
+}
+
+static void wait_for_ecb_end(void)
+{
+    while (!nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ENDECB) &&
+           !nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB))
+    {
+#if !defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
+        if ((SCB->SCR & SCB_SCR_SEVONPEND_Msk) == SCB_SCR_SEVONPEND_Msk)
+#endif
+        {
+            NVIC_ClearPendingIRQ(ECB_IRQn);
+
+            uint32_t irq_was_masked = __get_PRIMASK();
+
+            __disable_irq();
+
+            nrf_ecb_int_enable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
+            if (!nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ENDECB) &&
+                !nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB))
+            {
+                sleep_wfe();
+            }
+
+            if (!irq_was_masked)
+            {
+                __enable_irq();
+            }
+        }
+    }
+}
+
+static void ecb_block_encrypt(nrf_802154_hal_ecb_data_t * p_ecb_data)
+{
+    nrf_ecb_int_disable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
+
+    do
+    {
+        nrf_ecb_task_trigger(ECB_INST, NRF_ECB_TASK_STOPECB);
+        nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ENDECB);
+        nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ERRORECB);
+        nrf_ecb_data_pointer_set(ECB_INST, p_ecb_data);
+
+        nrf_ecb_task_trigger(ECB_INST, NRF_ECB_TASK_STARTECB);
+        wait_for_ecb_end();
+    }
+    while (nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB));
+
+    nrf_ecb_int_disable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
+    nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ERRORECB);
+    nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ENDECB);
+    NVIC_ClearPendingIRQ(ECB_IRQn);
+}
+
+#endif /* defined(CONFIG_MPSL) */
 
 static inline uint8_t * ecb_hal_cleartext_ptr_get(void)
 {
@@ -121,7 +203,7 @@ static inline uint8_t * ecb_hal_ciphertext_ptr_get(void)
 
 static void ecb_hal_key_set(const uint8_t * p_key)
 {
-    memcpy(m_ecb_hal_data.key, p_key, NRF_802154_SL_ECB_KEY_LENGTH);
+    memcpy(m_ecb_hal_data.key, p_key, NRF_802154_AES_CCM_BLOCK_SIZE);
 }
 
 /******************************************************************************/
@@ -436,7 +518,7 @@ static void ecb_hal_block_encrypted_handler(void)
 static void start_ecb_auth_transformation(void)
 {
     ecb_hal_key_set(m_aes_ccm_data.key);
-    memcpy(ecb_hal_cleartext_ptr_get(), m_x, NRF_802154_SL_ECB_CLEARTEXT_LENGTH);
+    memcpy(ecb_hal_cleartext_ptr_get(), m_x, NRF_802154_AES_CCM_BLOCK_SIZE);
     m_state.iteration      = 0;
     m_state.transformation = ADD_AUTH_DATA_AUTH;
     m_ecb_hal_req_run      = true;
@@ -444,7 +526,7 @@ static void start_ecb_auth_transformation(void)
     while (m_ecb_hal_req_run)
     {
         m_ecb_hal_req_run = false;
-        nrf_802154_sl_ecb_block_encrypt(&m_ecb_hal_data);
+        ecb_block_encrypt(&m_ecb_hal_data);
         ecb_hal_block_encrypted_handler();
     }
 }
diff --git a/nrf_802154/driver/src/nrf_802154_core.c b/nrf_802154/driver/src/nrf_802154_core.c
index bc0f01d1c1..265c2275be 100644
--- a/nrf_802154/driver/src/nrf_802154_core.c
+++ b/nrf_802154/driver/src/nrf_802154_core.c
@@ -758,7 +758,7 @@ static void operation_terminated_notify(radio_state_t state, bool receiving_psdu
             nrf_802154_transmit_done_metadata_t metadata = {};
 
             nrf_802154_tx_work_buffer_original_frame_update(mp_tx_data, &metadata.frame_props);
-            transmit_failed_notify(mp_tx_data, NRF_802154_TX_ERROR_ABORTED, &metadata);
+            transmit_failed_notify(mp_tx_data, NRF_802154_TX_ERROR_NO_ACK, &metadata);
         }
         break;
 
@@ -843,16 +843,6 @@ static bool current_operation_terminate(nrf_802154_term_t term_lvl,
     return result;
 }
 
-/** Enter Sleep state. */
-static void sleep_init(void)
-{
-    // This function is always executed from a critical section, so this check is safe.
-    if (timeslot_is_granted())
-    {
-        nrf_802154_timer_coord_stop();
-    }
-}
-
 /** Initialize Falling Asleep operation. */
 static void falling_asleep_init(void)
 {
@@ -862,7 +852,6 @@ static void falling_asleep_init(void)
     }
     else
     {
-        sleep_init();
         state_set(RADIO_STATE_SLEEP);
     }
 }
@@ -1212,7 +1201,6 @@ static void switch_to_idle(void)
 {
     if (!nrf_802154_pib_rx_on_when_idle_get())
     {
-        sleep_init();
         state_set(RADIO_STATE_SLEEP);
     }
     else
@@ -1884,7 +1872,6 @@ void nrf_802154_trx_go_idle_finished(void)
 {
     nrf_802154_log_function_enter(NRF_802154_LOG_VERBOSITY_LOW);
 
-    sleep_init();
     state_set(RADIO_STATE_SLEEP);
 
     nrf_802154_log_function_exit(NRF_802154_LOG_VERBOSITY_LOW);
@@ -2568,7 +2555,6 @@ static bool core_sleep(nrf_802154_term_t term_lvl, req_originator_t req_orig, bo
         }
         else
         {
-            sleep_init();
             state_set(RADIO_STATE_SLEEP);
         }
     }
diff --git a/nrf_802154/sl/include/nrf_802154_sl_ecb.h b/nrf_802154/sl/include/nrf_802154_sl_ecb.h
deleted file mode 100644
index bcc4d062b4..0000000000
--- a/nrf_802154/sl/include/nrf_802154_sl_ecb.h
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * Copyright (c) 2024, Nordic Semiconductor ASA
- * All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- *    list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
- *    contributors may be used to endorse or promote products derived from this
- *    software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef NRF_802154_SL_ECB_H__
-#define NRF_802154_SL_ECB_H__
-
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @defgroup nrf_802154_sl_ecb ECB encryption
- * @{
- * @ingroup nrf_802154_sl_ecb
- * @brief The ECB encryption API for nRF 802.15.4 Radio Driver
- */
-
-#define NRF_802154_SL_ECB_KEY_LENGTH        (16)                                           /**< ECB key length in bytes. */
-#define NRF_802154_SL_ECB_CLEARTEXT_LENGTH  (16)                                           /**< ECB cleartext length in bytes. */
-#define NRF_802154_SL_ECB_CIPHERTEXT_LENGTH (16)                                           /**< ECB ciphertext length in bytes. */
-
-/**@brief AES ECB parameter typedefs */
-typedef uint32_t nrf_802154_sl_ecb_key_t[NRF_802154_SL_ECB_KEY_LENGTH / sizeof(uint32_t)]; /**< Encryption key type. */
-typedef uint8_t nrf_802154_sl_ecb_cleartext_t[NRF_802154_SL_ECB_CLEARTEXT_LENGTH];         /**< Cleartext data type. */
-typedef uint8_t nrf_802154_sl_ecb_ciphertext_t[NRF_802154_SL_ECB_CIPHERTEXT_LENGTH];       /**< Ciphertext data type. */
-
-/**@brief AES ECB data structure */
-typedef struct
-{
-    nrf_802154_sl_ecb_key_t        key;        /**< Encryption key. */
-    nrf_802154_sl_ecb_cleartext_t  cleartext;  /**< Cleartext data. */
-    nrf_802154_sl_ecb_ciphertext_t ciphertext; /**< Ciphertext data. */
-} nrf_802154_sl_ecb_data_t;
-
-/**@brief Encrypts a block according to the specified parameters.
- *
- * @param[in, out] p_ecb_data  Pointer to the ECB parameters' struct.
- */
-void nrf_802154_sl_ecb_block_encrypt(nrf_802154_sl_ecb_data_t * p_ecb_data);
-
-/**
- *@}
- **/
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // NRF_802154_SL_ECB_H__
diff --git a/nrf_802154/sl/include/platform/nrf_802154_platform_timestamper.h b/nrf_802154/sl/include/platform/nrf_802154_platform_timestamper.h
new file mode 100644
index 0000000000..5bf9439056
--- /dev/null
+++ b/nrf_802154/sl/include/platform/nrf_802154_platform_timestamper.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2024, Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/**
+ * @brief Abstraction layer for peripheral-to-peripheral hardware connections needed for timestamping.
+ */
+
+#ifndef NRF_802154_PLATFORM_TIMESTAMPER_H_
+#define NRF_802154_PLATFORM_TIMESTAMPER_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Initializes the timestamper platform.
+ */
+void nrf_802154_platform_timestamper_init(void);
+
+/**
+ * @brief Sets up cross-domain hardware connections necessary to capture a timestamp.
+ *
+ * This function configures cross-domain hardware connections necessary to capture a timestamp of
+ * an event from the local domain. These connections are identical for all local domain events.
+ *
+ * @note Every call to this function must be paired with a call to @ref
+ * nrf_802154_platform_timestamper_cross_domain_connections_clear.
+ */
+void nrf_802154_platform_timestamper_cross_domain_connections_setup(void);
+
+/**
+ * @brief Clears cross-domain hardware connections necessary to capture a timestamp.
+ */
+void nrf_802154_platform_timestamper_cross_domain_connections_clear(void);
+
+/**
+ * @brief Sets up local domain hardware connections necessary to capture a timestamp.
+ *
+ * This function configures local domain hardware connections necessary to capture a timestamp of
+ * an event from the local domain. These connections must be setup separately for every local domain
+ * event.
+ *
+ * @param[in]  dppi_ch   Local domain DPPI channel that the event to be timestamped publishes to.
+ */
+void nrf_802154_platform_timestamper_local_domain_connections_setup(uint32_t dppi_ch);
+
+/**
+ * @brief Clears local domain hardware connections necessary to capture a timestamp.
+ *
+ * @param[in]  dppi_ch   Local domain DPPI channel that the event to be timestamped publishes to.
+ */
+void nrf_802154_platform_timestamper_local_domain_connections_clear(uint32_t dppi_ch);
+
+/**
+ * @brief Reads timestamp captured using the configured hardware connections.
+ *
+ * @param[out]  p_timestamp   Captured timestamp. Only valid if @c true is returned, undefined otherwise.
+ *
+ * @retval  true   The timestamp was captured and read successfully.
+ * @retval  false  The timestamp could not be retrieved.
+ */
+bool nrf_802154_platform_timestamper_captured_timestamp_read(uint64_t * p_captured);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_802154_PLATFORM_TIMESTAMPER_H_
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diff --git a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/hard-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/hard-float/libnrf-802154-sl.a
index f3636a2947..ecce7360e7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/hard-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/hard-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/soft-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/soft-float/libnrf-802154-sl.a
index f3636a2947..ecce7360e7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/soft-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/soft-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/softfp-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/softfp-float/libnrf-802154-sl.a
index f3636a2947..ecce7360e7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/softfp-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nRF54H20_CPURAD_SOC1/softfp-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/hard-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/hard-float/libnrf-802154-sl.a
similarity index 85%
rename from nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/hard-float/libnrf-802154-sl.a
rename to nrf_802154/sl/sl/lib/nrf54l15_cpuapp/hard-float/libnrf-802154-sl.a
index f3636a2947..c1ae7498d7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/hard-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/hard-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/soft-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/soft-float/libnrf-802154-sl.a
similarity index 85%
rename from nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/soft-float/libnrf-802154-sl.a
rename to nrf_802154/sl/sl/lib/nrf54l15_cpuapp/soft-float/libnrf-802154-sl.a
index f3636a2947..c1ae7498d7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/soft-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/soft-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/softfp-float/libnrf-802154-sl.a b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/softfp-float/libnrf-802154-sl.a
similarity index 85%
rename from nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/softfp-float/libnrf-802154-sl.a
rename to nrf_802154/sl/sl/lib/nrf54l15_cpuapp/softfp-float/libnrf-802154-sl.a
index f3636a2947..c1ae7498d7 100644
Binary files a/nrf_802154/sl/sl/lib/nRF54L15_CPUAPP_SOC1/softfp-float/libnrf-802154-sl.a and b/nrf_802154/sl/sl/lib/nrf54l15_cpuapp/softfp-float/libnrf-802154-sl.a differ
diff --git a/nrf_802154/sl/sl_opensource/CMakeLists.txt b/nrf_802154/sl/sl_opensource/CMakeLists.txt
index 505435548d..3a4a8c9c82 100644
--- a/nrf_802154/sl/sl_opensource/CMakeLists.txt
+++ b/nrf_802154/sl/sl_opensource/CMakeLists.txt
@@ -48,7 +48,6 @@ target_sources(nrf-802154-sl
     src/nrf_802154_sl_capabilities.c
     src/nrf_802154_sl_coex.c
     src/nrf_802154_sl_crit_sect_if.c
-    src/nrf_802154_sl_ecb.c
     src/nrf_802154_sl_fem.c
     src/nrf_802154_sl_log.c
     src/nrf_802154_sl_rsch.c
diff --git a/nrf_802154/sl/sl_opensource/src/nrf_802154_sl_ecb.c b/nrf_802154/sl/sl_opensource/src/nrf_802154_sl_ecb.c
deleted file mode 100644
index 8e67664fba..0000000000
--- a/nrf_802154/sl/sl_opensource/src/nrf_802154_sl_ecb.c
+++ /dev/null
@@ -1,109 +0,0 @@
-/*
- * Copyright (c) 2024, Nordic Semiconductor ASA
- * All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- *    list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
- *    contributors may be used to endorse or promote products derived from this
- *    software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include "nrf_802154_sl_ecb.h"
-
-#include <nrfx.h>
-
-#if defined(CONFIG_SOC_COMPATIBLE_NRF52X) || defined(CONFIG_SOC_COMPATIBLE_NRF53X)
-
-#include "hal/nrf_ecb.h"
-
-#define ECB_INST NRF_ECB
-
-static inline void sleep_wfe(void)
-{
-#if defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
-    void z_impl_k_busy_wait();
-    z_impl_k_busy_wait(10);
-#elif defined(CONFIG_SOC_COMPATIBLE_NRF52X)
-    __WFE();
-#else
-    /* Do-nothing. This includes nRF5340 series due multiple sleep-related anomalies (160, 165, 168) */
-#endif
-}
-
-static void wait_for_ecb_end(void)
-{
-    while (!nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ENDECB) &&
-           !nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB))
-    {
-#if !defined(CONFIG_SOC_SERIES_BSIM_NRFXX)
-        if ((SCB->SCR & SCB_SCR_SEVONPEND_Msk) == SCB_SCR_SEVONPEND_Msk)
-#endif
-        {
-            NVIC_ClearPendingIRQ(ECB_IRQn);
-
-            uint32_t irq_was_masked = __get_PRIMASK();
-
-            __disable_irq();
-
-            nrf_ecb_int_enable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
-            if (!nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ENDECB) &&
-                !nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB))
-            {
-                sleep_wfe();
-            }
-
-            if (!irq_was_masked)
-            {
-                __enable_irq();
-            }
-        }
-    }
-}
-
-void nrf_802154_sl_ecb_block_encrypt(nrf_802154_sl_ecb_data_t * p_ecb_data)
-{
-    nrf_ecb_int_disable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
-
-    do
-    {
-        nrf_ecb_task_trigger(ECB_INST, NRF_ECB_TASK_STOPECB);
-        nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ENDECB);
-        nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ERRORECB);
-        nrf_ecb_data_pointer_set(ECB_INST, p_ecb_data);
-
-        nrf_ecb_task_trigger(ECB_INST, NRF_ECB_TASK_STARTECB);
-        wait_for_ecb_end();
-    }
-    while (nrf_ecb_event_check(ECB_INST, NRF_ECB_EVENT_ERRORECB));
-
-    nrf_ecb_int_disable(ECB_INST, NRF_ECB_INT_ENDECB_MASK | NRF_ECB_INT_ERRORECB_MASK);
-    nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ERRORECB);
-    nrf_ecb_event_clear(ECB_INST, NRF_ECB_EVENT_ENDECB);
-    NVIC_ClearPendingIRQ(ECB_IRQn);
-}
-
-#endif /* defined(CONFIG_SOC_COMPATIBLE_NRF52X) || defined(CONFIG_SOC_COMPATIBLE_NRF53X) */