ST-Link fails due to too high RDP by mistakes. How to initialze to factory defaust if possible.

[SNish.1]

I came across a fatal trouble, Connecting ST-Link always fails.

This was caused unexpected RDP operation in the debug, that may have changed RDP=1.

It was observed that 'some' program is always starts even after Reset. In my observation, UART is survived. I have lost any way to update the broken FLASH.....

I would like to know ANY solution, such as 1) how to reset to factory defact, or 2) how to activate internal farmware which can make any recovery and what else.

The Target is STM32U575 ZI (144 pin)

Thanks.

Sumi. Nishie

[TDK]

STM32CubeProgrammer can be used to change RDP level 1 to RDP level 0. It should be changeable in the option bytes. However, RDP level 1 shouldn't cause the ST-Link connection to fail, so perhaps you have something else going on. Try to connect under reset.