RAK3172 (STM32WL) – ST-LINK & STM32CubeProgrammer Full Chip Erase Fails and Connection Is Unstable

LPWAN Modules / EVBs RAK3172
1

Hello,

I am using a RAK3172 (STM32WL) module with ST-LINK (SWD) and STM32CubeProgrammer.

I am trying to perform a Full Chip Erase, but I keep getting:

Error: Mass erase operation failed. Please verify flash protection.

I checked and reset all Option Bytes:

  • RDP = AA
  • PCROP = 0x00
  • WRP = 0x00
  • ESE disabled

After clicking Apply, STM32CubeProgrammer sometimes freezes and must be force closed.
After restarting, the connection becomes unstable:

  • DEV_CONNECT_ERR
  • Sometimes I cannot reconnect at all
  • Even when connected, full chip erase still fails

Board is powered from ST-LINK 3.3V, NRST is connected, SWD frequency tested at lower values.

Has anyone experienced similar issues with RAK3172 / STM32WL or has recommended CubeProgrammer settings?

Thanks in advance.

2

Welcome to RAK forum @enes18 ,

Some ideas:

  1. Use external 3.3V supply. But still connect it to ST-Link. ST-Link will detect the VDD level.
  2. For your setup, are you using an official ST-Link? Can you share your connection?
  3. You can try different reset mode on STM32-Cube Programmer. SW, HW and Core. Since NRST is connected, then you can use HW.
3

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.