Hi everyone, I am trying to make a firmware update sequence for my product and have an issue with readout protection enable/disable.

[VMkhi.1]

MCU : STM32F415

I enable readout protection successfully (customer requirement). Then in case of a new software update, I jump to the UART bootloader from my code. However, when in the bootloader I need to disable RDP. When I send RDP disable command and the device erases all firmware (as expected), disable RDP and exists bootloader.

The question is is it possible to prevent the MCU from resetting or exiting bootloader

[TDK]

No, changing RDP from level 1 to level 0 in the bootloader causes a reboot. The actual option bytes are stored in flash and a reboot is required to reprogram them.

At the end of the Readout Unprotect command, the bootloader transmits an ACK and generates a system reset to take into account the new configuration of the option byte.

You'll need a method to get back into the bootloader when it reboots which on that family requires a hardware solution to hold BOOT0 high.

[MM..1]

With custom bootloader isnt problem upgrade fw and have RDP=1. System bootloader dont support this ???

[Pavel A.]

Why do you disable RDP? In-app flash erase and rewrite should work with RDP enabled.

Do not confuse it with WRP.

Make  your own bootloader instead the built-in one.