Seller: advancednetwork ✉️ (1,651) 100%, Location: California, US, Ships to: US & many other countries, Item: 202610394921 Bios EFI Firmware Chip Apple iMac 21.5" A1418 Late 2013 i5 820-3588, EMC 2638 . EFI Firmware Chip for Apple iMac 21.5" A1418 Late 2013 i5 Logic Board: 820-3588, EMC 2638. Only for EMC 2638. Not sure about EMC number?. Fix Corrupted Firmware Caused During Updates. The chip needs to be soldered on the motherboard. AdvancedNetwork EFI Firmware Chip for Apple iMac 21.5" A1418 Late 2013 i5 Logic Board: 820-3588, EMC 2638 DESCRIPTION NEW Pre-Programmed Bios EFI Firmware Chip for Apple iMac 21.5" A1418 Late 2013 EMC 2638, Logic board 820-3588 Programmed and ready to use. This chip can be used for: Solve EFI Password-Lock, iCloud, 4 pin or 6 pin lock, Alphanumeric PadLock Fix Corrupted Firmware Caused During Updates Disabled Mac MDM Mobile Device Management (Remote Management) DEP Device Enrollment Profile (It will NOT remove the operating system password or Hard Drive password) The chip needs to be soldered on the motherboard. You need to have soldering skills to replace the chip The chip will come with a serial number or we can program your original S/N into the chip. Note: Do not use your original S/N if your Mac has MDM or DEP profile. 100% permanent fix. It is highly recommended to format and reinstall the MacOS after installing the chip. Only for EMC 2638 Not sure about EMC number? You can find the EMC number by visiting this website. everymac "dot" com / ultimate-mac-lookup I can help you find the correct chip for your motherboard if you need help. Please contact me if you have any questions RETURN POLICY We offer 30 days returns if there is any problem with the chip. Please contact us before opening case and we will help you to solve the problem. SHIPPING All orders are shipped within 24/ 48 hours via USPS First Class. (Free) Priority service: $4.99 Shipping International through Global Shipping Program FEEDBACK Feedback is very important to us. We will leave you 5 star positive feedback. I will appreciate if you can do the same 😊 Check out my other items! Condition: New, Brand: Macronix MXIC (original), Compatible Brand: For Apple, Type: EFI Chip, Logic board: 820-3588, EMC: 2638, Package: SOP-8