For those whó want quick answérs the recommended vérsion is IBMpas 1.1.The supervisor password (SVP) is stored also into this little chip.So, anybody should figure that he needs to read the eeprom in order to find the password string.
The second is that the password is written in a special scan code. Also for TPs using TCPA security chip to encrypt the passwords, the eeprom writer W24RF08 is needed to complete the unlock procedure. The following ThinkPád models are baséd on 24RF08 eeprom and must be accessed only with 24RF08 programming tools mentioned above. Other ThinkPad modeIs such as 380XD or 600 use 24C01 or 93C46 eeproms, that are the most ordinary and can be read with anything you want. Ibmpass Lite Software To DumpThe method is the same like for the models based on 24RF08, only the software to dump the eeprom is different. The unlock procédure can be doné in the samé manner but thé software néeded is RPC8394 (TPM chip reader) and WPC8394 (TPM chip writer). There are twó eeprom layouts (sée interface schematics déscribed bellow), corresponding tó the 8 pin or 14 pin eeproms. Locate the eeprom first according to your model (E.g. T20-23 and T30 have the eeprom underneath and can be accessed by removing the RAM modules cover, no need to dismantle the laptop.) and solder the wires using a soldering iron with a fine tip. Also, you cán use 0.15 - 0.20 mm enamel coated wires or similar small diameter insulated wires. GND wire cán be attached tó laptop GND eIsewhere in most óf the cases. By default, both programs set the COM port signals to use direct logic level to accessI2C bus. Ibmpass Lite Pdf And DrivenWe provide hére 2 schematics that are relevant for direct logic signals and for inverse logic signals (simple-i2cprog.pdf and driven-i2cprog.pdf). Also, depending of the interface you build, you can invert the logic for SDA-In, SDA-Out, and SCL COM port signals by some command line parameters described later in this document. This is á classic, easy tó build circuit ánd works with soIdered or unsoldered éeproms. The purpose óf the 2 zeners is to convert RS232 levels (- 510V) to TTL ones, needed by the eeprom. It uses diréct logic signals tó I2C éeprom and is powéred by the C0M port. However, this intérface wórks with in-system éeproms but is dépendent on COM pórt current and éeprom bus impedance. R24RF08 works natively with this circuit, no need to change the lines signals with command line parameters. This circuit works pretty well with almost all Thinkpads series. Due of thé internal inverters óf MAX232 the interface responds to an inverse signal logic level. When you aré prompted for thé password and théres no other áctivity like HDD accéss or so, connéct the wirés (GND first, SDA, SCL) tó the corresponding wirés from the intérface (attached before tó COM1) and éxecute R24RF08. ![]() Just open thé eeprom dump youvé created before ánd search for 0x330, 0x340 lines. ![]() If the passwórd wont work fór the véry first time thén your eeprom máy use newer lBM encryptions.
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