diff --git a/changelog.md b/changelog.md
index 6f182d43..17b88008 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,14 @@
+## 2.5.1
+
+#### Fixed
+Fixed problem with preserved transparent activity when paying with FPS using existing paymentId
+#### Changes
+Reworked logic of obtaining bank apps available for FPS payment to show all available bank apps
+regardless of default settings
+Changed mode of encoding CReq params with Base64 to NO_PADDING according to 3DS 2.0 requirements
+(https://www.emvco.com/terms-of-use/?u=wp-content/uploads/documents/3DSA_Bulletin_No_07_3rd_Ed_-_Base64_Base64url-Encoding_Final-2021-07-07-1.pdf)
+#### Additions
+
 ## 2.5.0
 
 #### Fixed
diff --git a/gradle.properties b/gradle.properties
index 575df6e0..e94efc50 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-VERSION_NAME=2.5.0
+VERSION_NAME=2.5.1
 VERSION_CODE=15
 GROUP=ru.tinkoff.acquiring
 
diff --git a/ui/src/main/AndroidManifest.xml b/ui/src/main/AndroidManifest.xml
index 626c6baf..fa19f3c9 100644
--- a/ui/src/main/AndroidManifest.xml
+++ b/ui/src/main/AndroidManifest.xml
@@ -17,6 +17,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="ru.tinkoff.acquiring.sdk">
 
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.VIEW" />
+            <data android:scheme="https" android:host="qr.nspk.ru"/>
+        </intent>
+    </queries>
+
     <application
         android:allowBackup="false"
         android:supportsRtl="true">
diff --git a/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/PaymentActivity.kt b/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/PaymentActivity.kt
index f5913d59..59fca428 100644
--- a/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/PaymentActivity.kt
+++ b/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/PaymentActivity.kt
@@ -23,6 +23,7 @@ import android.os.Build
 import android.os.Bundle
 import android.view.View
 import androidx.lifecycle.Observer
+import ru.tinkoff.acquiring.sdk.R
 import ru.tinkoff.acquiring.sdk.exceptions.AcquiringSdkException
 import ru.tinkoff.acquiring.sdk.exceptions.NetworkException
 import ru.tinkoff.acquiring.sdk.models.AsdkState
@@ -100,7 +101,7 @@ internal class PaymentActivity : TransparentActivity() {
                 }
             }
             SBP_BANK_CHOOSE_REQUEST_CODE -> {
-                if (data == null && asdkState is FpsState) {
+                if (data == null && (asdkState is FpsState || asdkState is BrowseFpsBankState)) {
                     finishWithCancel()
                 } else {
                     data?.getStringExtra(EXTRA_SBP_BANK_PACKAGE_NAME)?.let { packageName ->
@@ -161,33 +162,60 @@ internal class PaymentActivity : TransparentActivity() {
         when (screenState) {
             is FinishWithErrorScreenState -> finishWithError(screenState.error)
             is ErrorScreenState -> {
-                if (asdkState is FpsState) {
+                if (asdkState is FpsState || asdkState is BrowseFpsBankState) {
                     finishWithError(AcquiringSdkException(NetworkException(screenState.message)))
                 } else {
                     showError(screenState.message)
                 }
             }
-            is FpsBankFormShowedScreenState -> if (asdkState is FpsState) finishWithCancel()
+            is FpsBankFormShowedScreenState -> {
+                if (asdkState is FpsState || asdkState is BrowseFpsBankState) {
+                    finishWithCancel()
+                }
+            }
             else -> Unit
         }
     }
 
     @SuppressLint("QueryPermissionsNeeded")
     private fun openBankChooser(deepLink: String, banks: Set<Any?>?) {
-        var intent = Intent(Intent.ACTION_VIEW)
-        intent.data = Uri.parse(deepLink)
-
-        if (!banks.isNullOrEmpty() && Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
-            val activities = packageManager.queryIntentActivities(intent, 0)
-            val supportedBanks = activities.filter { banks.contains(it.activityInfo.packageName) }
-                    .map { it.activityInfo.packageName }
-            intent = BankChooseActivity.createIntent(this, options, supportedBanks, deepLink)
+        if (!banks.isNullOrEmpty()) {
+            val supportedBanks = getBankApps(deepLink, banks)
+            val intent = BankChooseActivity.createIntent(this, options, supportedBanks, deepLink)
             startActivityForResult(intent, SBP_BANK_CHOOSE_REQUEST_CODE)
         } else {
-            startActivityForResult(intent, SBP_BANK_REQUEST_CODE)
+            val intent = Intent(Intent.ACTION_VIEW)
+            intent.data = Uri.parse(deepLink)
+            val chooserIntent = Intent.createChooser(intent, getString(R.string.acq_fps_chooser_title))
+            startActivityForResult(chooserIntent, SBP_BANK_REQUEST_CODE)
         }
     }
 
+    @SuppressLint("QueryPermissionsNeeded")
+    private fun getBankApps(link: String, banks: Set<Any?>): List<String> {
+        // get sbp packages
+        val sbpIntent = Intent(Intent.ACTION_VIEW)
+        sbpIntent.setDataAndNormalize(Uri.parse(link))
+        val sbpPackages = packageManager.queryIntentActivities(sbpIntent, 0)
+                .map { it.activityInfo.packageName }
+
+        val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse("http://"))
+        val browserPackages = packageManager.queryIntentActivities(browserIntent, 0)
+                .map { it.activityInfo.packageName }
+        // filter out browsers
+        val nonBrowserSbpPackages = sbpPackages.filter { it !in browserPackages }
+
+        // get bank packages
+        val bankPackages = packageManager.getInstalledApplications(0)
+                .map { it.packageName }.filter { it in banks }
+
+        // merge two lists
+        return mutableListOf<String>().apply {
+            addAll(nonBrowserSbpPackages)
+            addAll(bankPackages)
+        }.distinct()
+    }
+
     private fun openDeepLinkInBank(packageName: String) {
         val payload = (paymentViewModel.screenChangeEventLiveData.value?.value as BrowseFpsBankScreenState).deepLink
         val intent = Intent(Intent.ACTION_VIEW)
diff --git a/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/ThreeDsActivity.kt b/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/ThreeDsActivity.kt
index b7b5c568..ca6e65c3 100644
--- a/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/ThreeDsActivity.kt
+++ b/ui/src/main/java/ru/tinkoff/acquiring/sdk/ui/activities/ThreeDsActivity.kt
@@ -192,7 +192,7 @@ internal class ThreeDsActivity : BaseAcquiringActivity() {
             put("challengeWindowSize", WINDOW_SIZE_CODE)
             put("messageType", MESSAGE_TYPE)
         }
-        return Base64.encodeToString(creqData.toString().toByteArray(), Base64.DEFAULT).trim()
+        return Base64.encodeToString(creqData.toString().toByteArray(), Base64.NO_PADDING).trim()
     }
 
     private fun requestState() {
diff --git a/ui/src/main/res/values-ru/strings.xml b/ui/src/main/res/values-ru/strings.xml
index c02d0666..ea027a84 100644
--- a/ui/src/main/res/values-ru/strings.xml
+++ b/ui/src/main/res/values-ru/strings.xml
@@ -22,4 +22,6 @@
 
     <string name="googlepay_button_content_description">Google Pay</string>
 
+    <string name="acq_fps_chooser_title">Выберите приложение</string>
+
 </resources>
\ No newline at end of file
diff --git a/ui/src/main/res/values/strings.xml b/ui/src/main/res/values/strings.xml
index 1b650714..9a3bc3ff 100644
--- a/ui/src/main/res/values/strings.xml
+++ b/ui/src/main/res/values/strings.xml
@@ -21,6 +21,8 @@
 
     <string name="googlepay_button_content_description">Google Pay</string>
 
+    <string name="acq_fps_chooser_title">Choose app</string>
+
     <string name="acq_fps" translatable="false">fps</string>
 
 </resources>