You need to extract a clean BIOS ROM ( "clean" = without any system-specific settings ) from a BIOS update utility. Try to open this utility (called something like "winflash_3.00.exe") as an archive with 7zip, and extract the contents of this .exe file using 7zip. If successful, it would give you a set of files, one of which might contain this clean BIOS ROM. Could be called something like WinVALGC300.bin ( you could guess it by looking at the file sizes ). Then open this file using a hexedit, search for $_IFLASH_BIOSIMG header. Not directly after but slightly further after this header, at the closest address ending by 0 (rounded by 0x10) there is a start of BIOS section, the size of which should be equal to a size of your BIOS chip. Copy-paste it into a new binary file, then you could try using it (but only after making a backup of your current chip contents!). You could also compare the contents of your original ROM image vs this "clean" image, to get an idea where a password might be stored (could be encoded instead of a plain text).
On Thu, Aug 15, 2019 at 4:27 PM Darko Svilkovic <[email protected]> wrote: > > Hi, > > Yes flashed with a windows update tool,which automaticly updates,has no > download ... > > Any help which program tu use to download the bios ... > > Read somthing like there are 2 chips for bios (one for bios and the other for > password and settings) ... > > thx > > On Thu, Aug 15, 2019 at 2:28 PM Mike Banon <[email protected]> wrote: >> >> "I have flashed the bios to a new version" - how you did that, using a >> windows tool provided by a laptop manufacturer? If yes, then it >> preserves the originally set password and maybe the other settings. >> Try to extract a "clean" BIOS image from the BIOS update utility >> provided by a laptop manufacturer. Then, using a flashrom-supported >> programmer like USB CH341A with a test clip (SOIC8 ?) together with >> our flashrom opensource tool, you might be able to flash a clean BIOS >> image (without any passwords/settings) into your BIOS chip. Of course >> please make a backup before flashing a new image, in the case it's >> incorrect or you'd need to borrow some Intel ME-related regions or to >> have a MAC address specified in your ROM in order for onboard Ethernet >> working. >> >> On Wed, Aug 7, 2019 at 12:01 PM Darko Svilkovic >> <[email protected]> wrote: >> > >> > hi, >> > >> > Hawe a problem with lenovo c540 AIO,bought this from a second hand,and >> > didn't see,and he didn,t mention that there is a bios admin pass ... >> > >> > I have flashed the bios to a new wersion,taked out the cmos >> > battery,jumpered the cmos jumper but with no success ... >> > >> > Now i heard that the password is in eeprom ... >> > >> > How to remowe it ??? >> > >> > thx >> > >> > Darko/Croatia >> > _______________________________________________ >> > flashrom mailing list -- [email protected] >> > To unsubscribe send an email to [email protected] _______________________________________________ flashrom mailing list -- [email protected] To unsubscribe send an email to [email protected]
