I Find out that there are a lot of people encountered this problem beside my brother, so i searched deeply and came to you with this two suggested solutions.
Solution no.1: Connecting the phone to a PC & using the SP Flash Tool.
The video: [ Ссылка ]
SP Flash Tool link: [ Ссылка ]
Solution no.2: Replacing the phone battery.
The video: [ Ссылка ]
Where to buy: [ Ссылка ]
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