write protection set, cannot erase

[ivanrusnacko]

Hi, when I try to program KL05 kit in Keil, it says Erase failed(no matter if full erase or sections erase). I know that FSEC byte is 0xFE so Mass Erase is enabled and it is unsecured. The problematic firmware which stays in flash had set the write protection to first 8 kB of flash. Also, there was a Program longword command at 0x409 in which it went to Hardfault IRQ.

I can debug that firmware and see the memory conent, so I know that FSEC byte is ok and first 8 kB are write protected.

But Keil doesnt ask me to mass erase, so how can I do it manually? Or is there any possiblity to save that kit?

Ivan

[albertovargas · Accepted solution]

Hi Ivan,

I'm not familiar with keil, Why you don't try doing a mass erase with CW?

Here's a tutorial about how to do it. Device is secure? | MCU on Eclipse

I hope it helps