Flashing by UART in STM32F411RE

[SAID_embadded]

After more debugging, the jump function works correctly (PC reaches 0x080208xx, SP and RST are valid), but the app never sends any UART message after jump — even with SystemClock_Config() completely commented out and only HAL_Init() + MX_UART_Init() remaining. The bootloader resets the clock to HSI before jumping. SCB->VTOR is set in SystemInit(). Linker is at 0x08020000. The app works perfectly when flashed directly at 0x08000000 via ST-Link. Something is killing the app immediately after the bootloader jumps but we can't figure out what — any ideas?
this is the project : 
https://github.com/said-sketch/Flashing-by-UART---STM32-Bootloader/tree/main

[TDK · Accepted solution]

If PC is at 0x080208xx, user code is being executed. If it's not doing what you want, there's likely a bug in the code, either the bootloader or the user code.

General jump to X code is here:

How to jump to system bootloader from application ... - STMicroelectronics Community

Yours looks considerably different. You will need to reenable interrupts, among other things.

[SAID_embadded]

thanks bro i really i fix it