MI4C No boot, no recovery, no fastboot

Hi,

After a LineageOS update, my phone would only boot in recovery mode. I updated TWRP and now my phone does not boot at all. Recovery mode is unavailable as well as fastboot. Only the "MI" logo appears on the screen. Phone is not recognized by my PC (LED does not even light up when charging).

Does anyone have a solution ? Can I install a ROM from a USB stick without going to recovery mode ? Thanks.

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