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Please
visit the Home
page for new developments
Instructions
on how to actually unlock your ThinkPad (TP) are in the User's
Guides
EEPROM
Location and Type
T420 EEPROM you
treat it as a 24RF08
Locating the T420
connection points
Switch the T420 OFF.
You should have already
downloaded the hardware Maintenance Manual for your ThinkPad
model, if you have not done so use the link below to download it
now,
Download
the Hardware Maintenance Manual (HMM) for your TP model
The links above are to the Lenovo site, if
it doesn't work, don't panic, it isn't broken, their site is
shut down daily for maintenance and at those times they display
spurious messages like the page you requested cannot be found,
wait a good while and try again.
Once you have your HMM search the
manual for "Removing and replacing a FRU" then
scroll down to System Board, follow the instructions in the
manual to remove the System Board to gain access to the connection
points.
SDA and SCL connection points are
shown in the photo below
I receive many emails asking about
the GND connection, in reality it is very simple, you use some kind
of a clip so that you don't have to hold it in place, you DON'T HAVE
3 HANDS and there are 3 connections, GND SDA and SCL, so have a clip
for GND, then you can use the 2 hands YOU DO HAVE to hold your SDA
and SCL probes in place.
Almost any large piece of metal or
the screws for the external connectors of any ThinkPad are a good
GND connecting point.
Anyway a picture is worth a thousand
words
Click
here for pictures of GND Connections
Keep
things from electrically shorting out, later you will need to plug
in the AC adaptor and switch ON the TP, then you will need to hold 2
probes in place to the SCL and SDA points on the system board.
See my page on Options
for Clips and Probes including making your own probes.
This page ONLY describes how to
connect the KeyMaker Interface to the EEPROM.
The instructions on how to Recover
or clear a Supervisor password are in The "User's
Guides" click here
Assembling your TP - AFTER - you have finished.
Follow the Hardware Maintenance Manual [FRU
System Board], very carefully, double check screw type and size
for each individual module. Assemble the TP in the reverse
order used to dismantle it.
Disclaimer
I make no warranty that any of my
information is correct, or safe, or does or does not breach any
warranty clause, or anything else, it is up to you to decide
if you will follow all or any of the instructions to recover the
Supervisor Password from a TP. It is up to you to decide, I am not
responsible for the results or for any consequential or incidental
damages whatsoever.
