Seller: dolphintek ✉️ (1,280) 100%, Location: Elmhurst, New York, US, Ships to: WORLDWIDE, Item: 324463331709 DolphinTek Pre-programmed BIOS EFI Firmware Chip For Imac A1418 A1419. It willNOT unlock theOS password. find the chip. replace the chip (requires skill to desolder and solder by using a fine-tipped soldering iron or a hot-air station). Want to save your original serial number?. Before purchase, please make sure all the specifications of your Imac match the listing title. The pre-programmed EFI Firmware chip can be used to unlock the EFI password (firmware password) and iCloud password lock . It will NOT unlock the OS 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 ebay 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. Condition: New, Model number: A1418 820-00597-A, Brand: Apple, Compatible Motherboard Brand: For apple, Type: BIOS Chip