Hi there,
I want to get maybe latest or stable Bios for the serial number:
JCorBXIW4H230400214
Currently, I’m stuck with a black screen 
Is it the correct bios for the laptop described here: Corebook X. Latest driver/bios 1235u/ 16g ddr5 - #2 by ChuwiSpainSupport
And: JCorBXIW4H230400001-JCorBXIW4H230400700 ?
This is the BIOS of your laptop
1 Like
Thank you so much. Seems like it’s a similar one but anyway, may I ask you for the help with the sequence keys when the screen is blank? 
Is it correct to push F7 button or, for example, to pull out SSD and just insert a flash disk with root bios copied and wait for updates? Is it enough or maybe some input during updating is needed? Something like Y/n or 1/2/3/4 options?
Currently, the laptop is in the loop state. I’ve pulled out SSD disk and wrote flash disk to the root folder previously formated to GPT type and FAT32. Flash disk is blinking consistently long time and nothing happens
Maybe you have some typical suggestions?
Seems like this is the story about SecureBoot. It must be disabled for BIOS update though.
Do you have some suggestions in this case? 
Understood that soldering WSON8 chip 25R256EYIG or clip is the last chance for this case. Will it be enough to write BIOS to this chip only?
In this case you would need to take it to a repair center. We are not able to help more from here
Flash bios directly resurrected the laptop. If someone is stuck like me and prefers to do it yourself:
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Make a current bios dump by ‘programmer’.
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Compare dump weight with current bios bin one.
2.1 if it’s equal, write the chip
2.2 if no - open dumped bios with ‘uefitool’ and extract padding at the end
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I am linux user so I’ve just read the padding and followed the output to the end of the new bion file:
cat bios.padding >> JXX-BI-WU133ALR210-ADA90A-001-J.bin- file increased from 16Mb to 32Mb and it’s ready to flash because of following error when just flashing original bios:
Error: Image size (16777216 B) doesn't match the expected size (33554432 B)! -
Done.
