Frozen screen problem whit Optimus

how to solve a frozen screen problem

It looks like there’s no sensitive screen. Have you flashed a wrong FW ?
The best is probably to flash the FW.

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how could i do that

I will try…thank you

I’m never a flash FW. I read somewhere that the clock should be in longstandby mode, except that it is off. NOTICE THAT THE SCREEN IS NON-SENSITIVE