After testing Proprietary code readout protection (PCROP) features, STM32F4 got bricked.Steps to reproduce:Enable SPRMOD for PCROP usage and enable PCROP bit 3 (Flash sector 3)Send an :unprotect:force DFU commandSTM32 will be bricked by now, not booting into USB DFU mode when pulling BOOT0 pin high

Associate II

Solved

Bricked STM32F446 after unprotect

After testing Proprietary code readout protection (PCROP) features, STM32F4 got bricked.

Steps to reproduce:

Enable SPRMOD for PCROP usage and enable PCROP bit 3 (Flash sector 3)
Send an :unprotect:force DFU command
STM32 will be bricked by now, not booting into USB DFU mode when pulling BOOT0 pin high

This topic has been closed for replies.

Best answer by VictorPr

Ok, solved.

For some reason, just plugin in USB while BOOT0 was tied high was not enough. Also had to pull NRST low to force reset and is working now.

VictorPrAuthorBest answer

Associate II

Ok, solved.

For some reason, just plugin in USB while BOOT0 was tied high was not enough. Also had to pull NRST low to force reset and is working now.