Hmm i have not tried a bios flash on a Core M board before but if you can get your hands another 1020 G1 you can read the bios from that and compare it with the one for the locked laptop
I can't find any EFI related records... No UUID's or volumes or any others signatures. It looks like a library of execution codes. It may be without an EFI of course. If you can do any changes in bios then probably we can find an area of changes. Also this notebook may have a second flash chip for settings storage.
Hey bigwezel could you do me a favor and post a picture of the board. I might soon be working on a 2015 macbook with the same core M CPU and trying to get as much info on them as possible before i dig into it. Also please point out the location of the bios chip on your board. Thanks!!
token.paul wrote: Zenelli, I am sorry but your file is 16.8 mbytes long. Original dump was 2.1 mbytes only... I think it does not fits to the chip. How you got it?
It's the main bin file who bigwezel posted, its 16mb.
the ec file i did not touch.
what i know is the password stored in the bios dump and not the ec dump for hp
Oh... I don't downloaded it.
It has very familiar data At quick look I guess that password is located at offset 0x6543E4. It is EFI variable, record length = 0xAF, with name "HP_BiosUser00BIOS Administrator". We can try to change one byte at offset 0x6543E6 from 0x7F to 0x7D. It will set this variable as deleted and it will not be loaded to the memory.
I managed to clear the admin password by shorting out pin 7 and 8. This was a method that worked on older HP laptops, but i figure it also work on the newer models.
I now have a Lenovo T450 with a supervisor password. These are a little more hard to figure out. The lenovo uses a technique that it decrypt the password needed to enter the bios when its on and requesting the password. If you dump the bios when it's not on there is no area for supervisor password. Do you guys know how to figure out a way around the supervisor password?
I managed to clear the admin password by shorting out pin 7 and 8. This was a method that worked on older HP laptops, but i figure it also work on the newer models.
I think it shorted legs 7 to 8 from the bios chip when starting up the laptop
Shorting 2 pins from eeprom chip works also for lenovo thinkpad laptops, removes bios password.
Maybe works also for Macbooks?
Shorting a chip is not a good idea when you do not know what it does. It can pop a fuse. Also if a fuse was popped to protect it then there is no going back. I tried shorting pins on a mac before with no luck but please if you are not afraid to lose it try and short them out. I would have to know what chip he was playing with but I bet he shorted the vcc and reset pins.
Can you please give us the chip ID BigWezel?
As far as this Lenovo goes I will have to have more information about it as well, so get to researching boys. I think it has an encryption chip that's in circuit which is great, but bad news for you. It will take a lot of playing.
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