What exactly does an enabled "Read Unprotect" checkbox?

[Gunnar Bohlen]

Hello, I used CubeProgrammer 2.7.0 to get infos about a board with STM32F??? (device marking on the chip not completely readable)

I enabled the checkbox "Read Unprotect", the documentation says it is "changing the RDP level from level 1 to level 0".

After this the device does not work anymore. Does the change of RDP level include erasing the firmware? Or can I change the RDP level back to 1 (how?) to get the device working again (I don't habve the original firmware to flash the device...)?

Thank you.

[TDK]

Changing RDP from 1 to 0 requires a full chip erase. If you've already done this, the firmware that was on there is lost.

[Gunnar Bohlen]

Thank you TDK.

Suggestion for the developer of the tool:

Please add a hint that setting the checkbox "Read Unprotect" might intialte a full chip erase.