Barometer and 83886 issue. Brand new watch, tried everything. Roll back to prev firmware?

Hi guys, 

Just got today an Instinct Solar and after updating it to the lastest non-beta firmware the barometer went nuts with the "83886" problem (I think i saw it working prior to the update, but im not sure).

GPS works fine but altitude and barometer are blank, and when trying manual input of values i get the "Sync Failed" message. Im asking here and not in the Solar forums cause ive seen that this happens with all instinct models...so...

- Im about to go to the store to get a replacement. Already tried everything (resets, hard resets, factory settings, good spot to get gps signal, etc)

- Would be an option to roll back to ANY working firmware, in case this is a SW issue? Im trying to find info/files on how to do this but nothing. Anyone know how to do it? Is it safe?

Many thanks in advance!