I tried to update original 4.4.4 and i cant.

I downloaded 6.1.0.0G and 6.2.0.0G official releases, execute it and nothing happens. The device restarts and nothing changes.

I tried a factory reset ( settings>about.. )... with and without format and nothing happens.

Seems like i cant start recovery mode. I start the device with " volume up + power " and it starts normaly.


   What to do ?


I tried to start fastboot mode ( volume down + power ) and seems like it works. But i have no idea about what to do here.