Merge pull request #534 from Kreyren/patch-2

lp4a/burn_image: Add clarification for the BOOT button

docs/hardware/en/lichee/th1520/lpi4a/4_burn_image.md

@@ -41,7 +41,7 @@ Linux: Use `lsusb`, the board should show up in burning mode as `ID 2345:7654 T-
 
 ### Official Hardware / Release Hardware
 
-Pay attention to check whether the DIP switch on the bottom board is in EMMC startup mode:
+In addition to holding the BOOT button as mentioned above, pay attention to check whether the DIP switch on the bottom board is in EMMC startup mode:
 
 ![switch_boot_mode](./../../../../zh/lichee/th1520/lpi4a/assets/burn_image/switch_boot_mode.jpg)
 
@@ -412,4 +412,4 @@ kernel-commitid
 ## Batch programming / flashing
 
 If you have commercial needs and need to burn firmware in batches, you can use the ARM/RV version of fastboot provided by sipeed to make an offline batch burner.
-If you need to burn a large number, you can also contact [email protected] directly , we provide pre-burning image service.
+If you need to burn a large number, you can also contact [email protected] directly , we provide pre-burning image service.