Lenovo T14s - MEC-1663 - Jtag - Pinout - for Bios Password Removal

Everything you need to remove the BIOS password from a Lenovo T14s (or any board with an MEC chip) and write the config data back afterwards.

How It Works

MEC chips store the BIOS password in a secure, un-editable area. The steps below clear that area so it re-initializes itself to default (blank).

Removing the BIOS Password

1. Read the MEC chip.
2. Erase the chip.
3. Unplug power from the board for 2 minutes.
4. Write back the dump you just read — the password is now gone.

Restoring the Serial / Model Number

After clearing the BIOS password you've also wiped the serial and model number. Restore them with the ThinkPad Config Information Update Utility v1.11 (attached below). Serial/model info can usually be found on the motherboard stickers and the bottom cover.

1. Extract and run usbfmtpw.exe — this formats your USB and copies the files over. (Check the files copied after formatting; if not, manually copy them to the root of the USB.)
2. Insert the USB into the laptop and boot to it as USB FDD (EFI, not Legacy).
3. Choose 1, then use 2 to read the current keys. Record any keys shown — take a photo, as they'll be erased if not already.
4. Go back to the main menu and choose Initialize EEPROM. This clears all keys plus the UUID and stops the overflow error.
5. Choose 1, then 1 again to add new info. Enter C0 then Enter.
6. Enter the serial and model in long form — it starts with 1S, so 1STTTTMMMMCCSSSSSSS.
7. Press Enter and the key is stored.
8. Optionally add more, or use option 3 for a few extra config details (I set my brand name there).
9. Once all info is set, go to Assign UUID and say Yes. (Once you generate the UUID you cannot edit the serials again unless you initialize and redo them all.)
10. Reboot and check the BIOS screen — your info should be there, with no more beeps on boot.

Product ID: TTTT-MMMMCC
Serial#:    SS-SSSSS

TTTT    = Machine Type
MMMM    = Model Type
CC      = Country Code
SSSSSSS = Serial Number