We had a power failure and after power restored phone turns on and is just showing grandstream like is booting but nothing changes. Is it possible to fix boot?
Please try factory reset (manual) from start.
But it can be damaged so bad that no fix will be available.
All I could find in manual is how to reset if you are in menue but I’m not. There is no recovery or something like that
Restore to Factory Default via Hard Keys
It worked!! Thx