Lab-One Forum

Please help with the Acer R721T Chromebook bios file. Thank you! I can't write my saved bios anymore because it gives an error (contents are in disagreement!)

PLEASE ATTACH YOUR BACKUP FILE I WILL FIX

My file is in attachments

It has 1.8v eeprom ic. You must use 1.8-volt adapter, if you are getting the error. Or, if you have rt809f programmer, then there is no need of a 1.8v adapter. Just use Winbond w25q128fw, and press the auto-detect button. Then select manually w25q128fw 1.8vn. By doing this, you can fix the problem 100%.

in these models, the other Chromebook backup files will not word even if the model is the same

I will unlock your bios if you have an original backup

Enjoy write this bios and plug your chrome recovery USB and install it, (imported) when recovery finish Don't connect wifi (Powerwash it ) Press and hold Ctrl + Alt + Shift + r after Powerwash Your chrome ready and unlocked

Thank you! The Bios file was not to blame, but a piece next to it that had flown when I blew hot air. It started and unlocked according to your instructions. Thank you very much!

Excuse me, I have the same chromebook, but mine has school enrollment protection, oh business, if I install this bios .bin with my CH341A programmer, will my chromebook skip the enrollment protection? oh how can i do to repair my own bios and skip the protection? please help

Use CH341A programmer And Programm For Unlock