@lolypop000
No success this time. WebUpdare returns error.

@kunix
Steps:
0. Done
1. Done
2. I tried via Web Updater - I got the message - device returned the error state while receiving data packets. - This is my translation from Polish.
So, next shoot - I prepared rgn file from original gcd with RGN Tool. No changes inside, only opening gcd and save as rgn. After that I got from updater.exe - "The Garmin device is unable to program the requested memory region."
On the screen still squares. PC connection availabe.