So I have this CB from my school ( they gave it to me) and its still enrolled and i tried telling them to unenroll it but it did not seem to work so i found out about this and i wanted to see if i could get a bios bin/rom file for my 25q128jvpm winbond chip. I have tried multiple method but nothing works because it firmware locked like I can’t get into dev mode or boot off of usb and I can’t add my personal account.
Are you going to flash externally?
Yea
You can send it to me (the rom file) and I’ll just modify the file for you
All you really need to do is delete gbind/ubind and change sn/mlb, of course after taking a backup of the current VPD.
Why gbind/ubind/MLB? I’ve never touched those
Someone mentioned to me that you might need to. I guess I never tried not touching them so you may not need to. The code for enrollment is obviously closed source so hard to say for sure what it is or if it has changed between updates.
Yeah I’m not sure either, but I only change the serial and delete the stable_device_secret (which only matters for enrollment) and then delete block_devmode and check_enrollment, but I’m not sure that anything in RW_VPD needs changed
Oh right I forgot stable device secret. check_enrollment does nothing now and afaik block_devmode is entirely useless on cr50 devices.
So it seems like serial number is the only thing needed to unenroll it, but stable device secret if it’s to be enrolled in the future…
Do you know what gbind/ubind are for? I know shims will fail and give an error about those missing if they aren’t there.
IIRC for chromebook perks
How do I know what to put as the stable number tho?? Because I have figured it out and how to get to the numbers and stuff but how do I know what to change and what number to put it as. I am going to get the ch341a thing later this month but I want to get everything ready
just delete it
and as far as the serial number, just make it something unique
Like what??
uhhhh anything unique just like a password. If the current serial is ABCXYZ change it to ABCXYZ3456789 or anything else it doesn’t matter as long as you use accepted characters
Alright and how do I find the serial number/stable number
Are you sure you know what you’re doing?
Once you have the ch341a what is your plan?
Open the Chromebook and connect it and then open something like asprogrammer and read it then edit it in hxd editor, I’m just making sure
I’m not familiar with asprogrammer so I can’t help you, I’ve only ever used flashrom in Linux
I know how to do the read thing and how to like edit it but I want to know like what to make the stable number and umm what is the dev mode block thing called or how do I enable dev mode?