Any way to unbrick a chinese Windows Tablet Ezpad 7?

[huguito]

Hi. I have a strange chinese Windows Tablet: Jumper Ezpad 7 model 4s (or Zhongbai Ezpad 7 model 4s, it's a generic windows tablet). Works perfect, no overheat, good battery performance, you can play some AAA optimized videogames like GTA V from MicroSD, it's the perfect tablet to choose for work and playing, using 4gb ram and Intel Atom z8350 processor. I changed some stuff in BIOS like USB settings and AHCI options if I remember correctly.... after that, the tablet won't work anymore, when power on, the tablet got the annoying Windows 10 Metro bluescreen and can't boot to BIOS settings, the usb 3.0 port won't work anymore, so you can't plug usb keyboard and tablet's magnetic keyboard port won't work too. It's a nightmare!. I opened the tablet case, disconnected the battery and connecting to reset BIOS settings, sadly to my surprise, this trick doesn't work and still booting bluescreen!. I asked about this situation to my chinese seller from Aliexpress, explained to me the solution of flashing the BIOS. So I bought a CH341A device, I backed up the bios, then I flashed the bios, and the tablet bricked surprisingly!!. The tablet won't turning on anymore, because the screen turned black, and the LED turned into constant green LED. Hopefully everything like battery charging system works, and maybe usb, but I used keyboards while the screen is black, pressing keys like Delete, F12, every key but nothing happens. After that, I flashed the chip using the original bios backup file, but still nothing work!! Blackscreen and green LED turned my tablet into a nightmare.
The worst about this case, is my seller after explaining my situation, he doesn't know how to help me more. Also, the non-existent helpful articles or tutorials in internet about these type of chinese tablets! Chinese users from Baidu and English users asking about how to fix this tablet, and saying the tablet maybe is just a scam. Nobody knows how to fix this tablet, so I need help from this forum if it possible, I don't wanna trash my tablet. I will attach my bios file here.

Motherboard data about Ezpad 7: Uses a Gigadevice GD25LQ64cvig bios chip, id MBJ201, name INET-J2012-rev10, zeng-gc 2017-12-20

File: https://disk.yandex.ru/d/F2NtWz1VQcnw8w


  biosmod-file-ezpad.bin (Size: 8 MB / Downloads: 4)