m6s keeps crashing after 7.1.5 g update

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1

2019-11-07 20:00

My phone is just a few months old, when I purchased it it's on flyme 7.0. or 7.1.0 but a few days ago I have updated it to the latest 7.1.5g. and now my phone crashes and keeps on restarting even on full battery. it stops restarting only when plugged.
any ideas on how to get it fixed? will downgrade or factory reset work? thank you very much!