My dad accepted upgrade offer from the FlyMe OS.
After first restart, the recovery mode poped up.
From then, i tried to install the firmware again, without success - “Firmware corrupt”.
Since then i tried every (!!) firmware there is (Flyme 4-5) including the beta new versions (FlyMe 6), Unfortunately every time the same “Firmware corrupt” message.
Always i checked the “Clear data”.
According to the s/n, the phone is international version (G/I Firmwares) , but i tried also the Chinese versions (A), all of those without success.
There is no problem to start the phone to Fastboot mode, but it isn’t rooted.