I turn it off by taking battery out.

Before these days it can go to preboot, but after I downgrade to 4.52beta, It can not access to preboot anymore. (Pressing UP+Connecting for more than 30-60sec.)

I try several versions, 7.2/7.1/..down to 5.90 to find the one that doesn't has error during flashing.

I feel that I still have some hope because I can flash FW by updater.



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