Won't boot and red light blinking while charging

Hello,

My Huawei P20 Pro won't boot.

When I charge it the screen stays black, there is only a small red light blinking every 1s (at the top of the screen near the speaker).

Also, I tried to boot with the battery disconnected. In this case, it is stucked in a boot loop : HUAWEI logo showing 1~2 s, then reboot, over and over.

What kind of failure could it be ? Is the battery dead ? Or may be the charge connector ?

Please help.

Thx

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