STM32 MCUs Embedded software

I use STM32L0 series board so here we have to design code for UART Bootloader for FOTA i tried some possibilities following datasheet (AN2606 Application) process but i didn't get result so please send me some example code.I am waiting for your reply.

Please support me to complete this task.------------------------------------------------------------------------------Thanks & Regardsswapnil Maskar.M:9767067210

Is there any example of use for the HS and FS ports independently with the use of RTOS, or without the use of RTOS?

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