Dear NORDIC engineers, excuse me. I would like to inquire about the Settings of NRF54LM20 APPPROTECT. I have modified APPROTECT[n].protect0 and APPROTECT[n].protect1 to 0x5A5A5A5A. SECUREAPPROTECT[n].PROTECT0 and SECUREAPPROTECT[n].PROTECT1 have also been modified to 0x5A5A5A5A. However, after re-powering, the chip can still be connected and the FLASH can be read. The software used is J-Flash 9.30a. According to the manual instructions and my development experience with the NRF54L15, these registers should enable Access Port protection once they are set to values other than 0xFFFFFFFF.

NRF54LM20,APPPROTECT

Heracles 1 month ago

Dear NORDIC engineers, excuse me. I would like to inquire about the Settings of NRF54LM20 APPPROTECT. I have modified APPROTECT[n].protect0 and APPROTECT[n].protect1 to 0x5A5A5A5A. SECUREAPPROTECT[n].PROTECT0 and SECUREAPPROTECT[n].PROTECT1 have also been modified to 0x5A5A5A5A.However, after re-powering, the chip can still be connected and the FLASH can be read. The software used is J-Flash 9.30a. According to the manual instructions and my development experience with the NRF54L15, these registers should enable Access Port protection once they are set to values other than 0xFFFFFFFF.