After you need to find bios location on the board is better if you unsoldered check if is low voltage or normal and use write attachment connect to computer read the chip and save copy to be sure you not get it worse if that copy is not compatible with your model is chance to not light up. And after start reprogram clear and install file on it after solder and that is welcome to your new tablet.
Regards Ned
Сделал снял видео: https://youtu.be/26J4Ie-oXt0?si=P8WdPx5xmDN0zowI Я сделал планшет Chuwi hi10 x. Лежал 6 лет без ремонта. Я заказал чип bios 25lb64cvig с АлиЭкспресс. Прошил программатором ch341a через adapter 1.8 volt. Заменил чип bios на новый. Работает как новый. Показывает windows 10 со звуком. / Отключение АКБ не сбрасывает настройки BIOS. Используется NVRAM, а не CMOS то есть нет доп. батарейки или перемычки для сброса, по этому нужно заменить чип bios.
I made a video: https://youtu.be/26J4Ie-oXt0?si=P8WdPx5xmDN0zowI I made a Chuwi hi10 x tablet. It had been lying for 6 years without repair. I ordered a 25lb64cvig bios chip from AliExpress. I flashed it with a ch341a programmer using a 1.8 volt adapter. I replaced the bios chip with a new one. It works like new. It shows windows 10 with sound. / Disabling the battery does not reset the BIOS settings. NVRAM is used, not CMOS, that is, there is no additional batteries or jumpers to reset, so you need to replace the BIOS chip.