Before purchase, please make sure all the specifications of your Imac match the listing title.

The pre-programmedEFI Firmware chipcan be used to unlock theEFI password(firmware password) andiCloud password lock.It willNOTunlock theOS password.

What skill you need :

1. disassemble the laptop

2.find the chip.

3.replace the chip(requires skill to desolder and solder by using a fine-tipped soldering iron or a hot-air station)

4. re-assemble the laptop.

Want to save your original serial number?send us the serial number from the bottom cover via message,no additional charge!without that,there would be no serial number in the system after install the chip.

If you have any questions, please feel free to ask us.