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Aporte original por: Tomáš Tomovčík ,

Texto:

These phones usually run MTK CPUs. Try holding Volume- and Power button for 15 seconds. If that doesn´t work, connect it to computer and try to look in device manager if it shows as one of these:

- MT65xx Preloader

- Unknown Device

- Serial2USB Device

- Android device

- MTP USB device.

If yes, there is a software issue and phone needs to be flashed with stock ROM, which is usually bunch of .img files, not the OTA zip that you can download from the vendor´s site.

Estatus:

open