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Had the same problem with Umidigi Z2 since a couple of weeks. Today i've connected the dead phone with my linux-pc. The kernel-log shows an usb-device trying to connect and a short time later the phone boots like there's nothing been! The battery was at 21%, last full loading was 52 days before. I've no idea, what's going wrong to semi-brick the device and why it boots after connecting with the pc.
Maybe your phone awakes the same way, if connected with a pc? |
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