I already tried to downgrade with 2.40 and 2.60 firmware. But with old firmware edge hang on initial Garmin splash screen.
I have formatted with diskpart too (FAT32)... without any positive results.
With firmware 2.7 Edge boot regularly, but immediately say "DATABASE ERROR". Then say "MEMORY FULL" every 20-30 seconds. GPS start but not record any data.
With old firmware Edge remains on initial splash screen... Boh..