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GPS 0.00 after upgrading FR235 to 820 - looking for working firmware

So, after upgrading to 820, the GPS is not working and the version is 0.00

WebUpdater keeps loading a new firmware for M5 chip, but the watch does not consider it (the watch does not update after loading the firmware in the RemoteSW directory).

I tried downgrading to 7.80 and 7.81: same issue.

The only GPS firmware that the watch is updating to is the GUP2423-240 coming with the 7.81 Beta...But it does not solve the GPS 0.00 issue as probably too old to contain the SONY chipset fix.
https://www8.garmin.com/support/download_details.jsp?id=10451

My questions are:

1 - why the FR235 watch will not consider upgrading with the latest M5 Chipset upgrade uploaded by Webupdater/Garmin Connect?

2 - Any other other GPS firmware lying around that I could try?

Thanks