Apple · laptop motherboard

Apple iMac 27 820-3481

BIOS
Board code
820-3481
Revisions
Rev A
Files
1
Updated

Apple iMac 27 820-3481 is a laptop motherboard used in the Apple iMac 27.

The catalog has one BIOS file for it, posted in 2022. Each download button opens the original Telegram post.

The files are marked Rev A; other revisions of the same board can differ in parts and layout.

Read and save the original chip contents before you write anything to it — Keeping the Windows Product Key (MSDM) When Reflashing a BIOS.

Compatible models

  • Apple iMac 27

Files for Apple iMac 27 820-3481

BIOS and firmware 1 All bios and firmware →

Frequently asked questions

Which laptops use the 820-3481 motherboard?
File names in the catalog tie 820-3481 to the Apple iMac 27. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of 820-3481 do I have?
Files for this board mention Rev A. The revision is printed on the PCB silkscreen, usually next to the board code. Pick files with the same revision when you can; if yours is not listed, the closest revision is usually fine for the schematic but check part positions in the boardview carefully.
What should I check before flashing the 820-3481 BIOS?
Read the original chip with a programmer and save two copies before writing anything. A dump from another board carries that board's serial number and MAC address, so restore yours from the backup.

Guides for this board

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Files are hosted on Telegram by third parties; ExcitingSpas.com only links to public posts. Check that a file matches your board before using it. Disclaimer · Report a file