Hi Sergey,

> Both CMP and WPS bits got set in the status register. The chip was 
> successfully flashed after both bits were cleared.

I'm curious: Please tell, how you clear these CMP and WPS bits? What
command do you run to do this?

чт, 25 нояб. 2021 г. в 23:44, Сергей Янович <sergei.ianov...@yandex.ru>:
>
> On Thu, 2021-11-25 at 17:02 +0300, Сергей Янович wrote:
> > On Wed, 2021-11-24 at 13:17 +0300, Mike Banon wrote:
> >
> > > P.S. I hope that your 1.8V chip wasn't partially damaged by a
> > > temporary usage of 3.3V on it
> >
> > It is possible, but seems unlikely. The chip correctly responds to
> > flasrom probing queries. I suspect I activated a write protection of
> > some kind. /WP is high at 1.81V now. So I am investigation software WP
> > in the chip now.
>
> SOLVED. For reference.
>
> I guessed correctly. Both CMP and WPS bits got set in the status
> register. The chip was successfully flashed after both bits were
> cleared. I used a small C program for reading and writing. The program
> was made along examples in [1].
>
> 1. 
> https://www.emcraft.com/stm32f769i-discovery-board/accessing-spi-devices-in-linux
>
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