Dash Cam Pro Plus Plus Logo Stuck in Display


I Have 70Mai Dash Cam A500s Dash Cam Pro Plus Plus  9f28 , i bought it 5 days ago , it was running fine suddenly the 70mai logo always apeared in display , all buttons are functioning   , i have resetted it so many times , changed firmware by inputing memory card , but same problem happen 

memory card not formatting 

not recording

cannot see live video through app

cannot  push latest firmware update by apps .

please help me

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