Force restore on Viettel devices

How to force a factory reset or hard reset on Viettel devices

Viettel V8405 Viettel V8405
Viettel V8404 Viettel V8404
Viettel V8403 Viettel V8403
Viettel I9 Viettel I9
Viettel I8 Viettel I8
Viettel I67 Viettel I67
Viettel I6 Viettel I6
Viettel Easy 5 Viettel Easy 5

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