T95Z PLUS Android 12 - Allwinner H618 - 4 GB/32 GB Help

Hi Please, I need help !

I bought a T95Z PLUS Android 12 - Allwinner H618 - 4 GB/32 GB
Model Pixel 3
Version bigdroidOS 2.0.1
Amdrpod PS Build 12.1.A3

Every time I want to update from System Update I got a error:

Battery too low or in battery saving mode.

and I cant update.

How I can fix the problem ?

Thanks.