Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

[The ENIGMA]

is there any way to reprogram this chip
or reset it to remove stored password keys
there no even data sheet for it but I found it in a
laptop board schematics
HP elitebook 2540p
it's number u34 and the SPI bios chip u35
i'm afraid to do anything without an advice I could blown the chip with no chance to get this pc back to life
PLEASEEEEEEEEE HELP

[diif]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

To clear the TPM you need to enter the BIOS. The TPM only holds the bitlocker key.
You will lose access to the files though if they have been encrypted by bitlocker.

[The ENIGMA]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

the bios has an administrator password
when i try to remove it by removing Cmos battry it locked out
now i can't do anything with this laptop till i enter admin password

[stj]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

passwords are usually stored in the flash,


if you want to get rid of ithe tpm try shorting the crystal, some laptops wil run without it because they sell export models to some country's without the chip.

[The ENIGMA]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

thanks Stj
how can i short the TPM chip
excuse my ignorance
i'm afraid
short which pin to the ground ??

i've tried reflashing ,,, all bins availabe 3.0mb the backed up was 8.0mb
i've tried ver f.09 f50 but no boot after programing
seem it's business laptop with custome german bios

[stj]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

on your own attached schem are 2 pins on the chip that connect to the crystal (13 & 14) - link the pins together and the chip wont run.

[The ENIGMA]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

thanks STj
I understand now that TPM chip has nothing to do with locked bios I removed it totally like you said laptop worked but still asking for passwords
it's a BIOS chip matter I'll try to find the right clean software then reprogram it
I got this wrong I thought this chip stores password
thanks for your help your time

now i'm looking for clean bios for Elitebook 2540p
it's mainboard is COMPAL KAT10 LA-5251p Rev 1.0

[The ENIGMA]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

To clear the TPM you need to enter the BIOS. The TPM only holds the bitlocker key.
You will lose access to the files though if they have been encrypted by bitlocker.

you are right i thought this chip stores all passwords not only the bitlocker key
I understand now thanks

[adekunlekunle]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

do you have the tpm 1.2 file
pls help

[stj]

Re: Infineon TPM 1.2 Chip slb 9635 tt1.2 please help

there is no file, the tpm is just a password encrypted eeprom that the bios stores keys inside.