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Can not read memory! Disable Read Out Protection and retry

Question asked by Rajesh Tripathi on Apr 16, 2017
Latest reply on Oct 30, 2017 by Reema O

Hello, I have problem with a custom stm32f437 based board. It was working for few days then suddenly stopped working and can't program it anymore From keil/St-Link setup.

 

Installed the ST-Link utility (V4.0) and updated firmware on ST-Link. When I try to connect it says

 

"Can not read memory!
Disable Read Out Protection and retry."

 

Not sure how it got into "Read Out Protection Level 1"  as I had never even used ST-Link Utility.

When I try to switch to ROP level 0 and deselect all sector and apply, it complains

 

"Could not set Option bytes!
Please reset the target and retry."

 

Already reset/retry many time with no improvement!

 

The board is unusable now. Please help.

 

 

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