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- Apple iMac 27 A1419 D8 MLB ULTIMATEBIOS · 8.79 MB · 9 Jul 2019BIOS zip—8.79 MB
- Apple iMac 27 Late 2013 (820-3481-A)BIOS · 820-3481 · 8.00 MB · 12 May 2025BIOS bin8.00 MB
- Apple iMac 27 5K Retina 820-00609-ABIOS · 820-00609 · 8.00 MB · 10 May 2025BIOS bin8.00 MB
- Apple iMac 27 Late 2013 (820-3481-A)BIOS · 820-3481 · 8.00 MB · 10 May 2025BIOS bin8.00 MB
- Apple-iMac-A1312-820-2733-A-Bin-BiosBIOS · 820-2733 · 1.61 MB · 1 Jan 2022BIOS rar1.61 MB
- Apple iMac 27 Late 2013 (820-3481-A)BIOS · 820-3481 · 8.00 MB · 21 Jul 2020BIOS bin8.00 MB
- AFS Apple iMac 27 5K Retina 820-00609-ABIOS · 820-00609 · 8.00 MB · 22 Jan 2024BIOS bin8.00 MB
- Apple iMac 27 Late 2013 A1237 820-2179-CBIOS · 820-2179 · 4.00 MB · 21 Jul 2020BIOS bin4.00 MB
- apple iMac 27 A1312 820-2828-A MX25L6406E TESTED OKBIOS · 820-2828 · 3.48 MB · 15 Dec 2024BIOS zip3.48 MB
- Apple iMac 27- Late 2013 A1237 820-2179-C.binBIOS · 820-2179 · 1.72 MB · 4 Jan 2024BIOS zip1.72 MB
- apple iMac 27 A1312 820 2828 A MX25L6406E TESTED OK telegram BIOSBIOS · 820-2828 · 3.62 MB · 17 Sept 2025BIOS zip3.62 MB
- BIOS Apple iMac 27 Late 2013 820 3481 A telegram BIOS Repair 2025BIOS · 820-3481 · 8.53 MB · 18 Sept 2025BIOS zip8.53 MB
- Apple iMac 27 5K Retina 820 00609 A telegram BIOS Repair 2025 09BIOS · 820-00609 · 5.02 MB · 17 Sept 2025BIOS zip5.02 MB
- Apple iMac 27 5K Retina 820 00609 A 1 telegram BIOS Repair 2025BIOS · 820-00609 · 5.02 MB · 17 Sept 2025BIOS zip5.02 MB
- Apple iMac 27 Late 2013 (820-3481-A)BIOS · 820-3481 · 5.59 MB · 20 Jan 2024BIOS rar5.59 MB
- Apple Apple K23F 051 8233 G 820 2733 A iMac 27″ A1312 biosBIOS · 820-2733 · 5.52 MB · 23 Feb 2026BIOS rar5.52 MB
- IMACK 27 A1312 820 2828 A MX25L6406E WORKING BIOS 100% telegramBIOS · 820-2828 · 3.62 MB · 23 Sept 2025BIOS zip3.62 MB
- Apple iMac 27 Late 2013 (820-3481-A)
Firmware image for the Apple iMac 27 inch Late 2013, logic board 820-3481-A, where A is the revision suffix in Apple 820 numbering.
BIOS · 820-3481 · 8.00 MB · 23 Oct 2021BIOS bin8.00 MB - Apple iMac 27 5K Retina 820-00609-A
Boot ROM firmware for the Apple iMac 27-inch 5K Retina on logic board 820-00609-A, stored as a 4.25 MB RAR.
BIOS · 820-00609 · 4.25 MB · 20 Jun 2020BIOS rar4.25 MB - BIOS Apple iMac 27 Late 2013 (820-3481-A)
BIOS image for the Apple iMac 27-inch Late 2013, logic board 820-3481-A, compressed in a 7.80 MB RAR.
BIOS · 820-3481 · 7.80 MB · 28 Mar 2022BIOS rar7.80 MB - Apple iMac 27 Late 2013 A1237 820-2179-C
EFI firmware dump labelled for an Apple iMac 27 inch Late 2013, A1237, with logic board 820-2179-C, revision C.
BIOS · 820-2179 · 4.00 MB · 23 Oct 2021BIOS bin4.00 MB - Apple iMac 27 Late 2013 (820-3481-A) Clear me
Cleaned EFI firmware for the Apple iMac 27 inch Late 2013 on logic board 820-3481-A, the Clear me note implying the image was prepared without the original machine data.
BIOS · 820-3481 · 8.00 MB · 21 Jul 2020BIOS bin8.00 MB - apple iMac 27 A1312 820-2828-A MX25L6406E TESTED OK
Firmware dump for the Apple iMac 27-inch A1312, logic board 820-2828-A, read from an MX25L6406E SPI flash chip and marked as tested OK, supplied as a 3.53 MB ZIP…
BIOS · 820-2828 · 3.53 MB · 5 Sept 2023BIOS zip3.53 MB - Apple iMac 27 5K Retina 820-00609-A
Firmware dump for the Apple iMac 27-inch 5K Retina logic board 820-00609-A, packaged as a 4.29 MB RAR.
BIOS · 820-00609 · 4.29 MB · 25 May 2022BIOS rar4.29 MB - IMACK 27 A1312 820-2828-A MX25L6406E WORKING BIOS 100%
Working BIOS for the Apple iMac 27-inch A1312 with logic board 820-2828-A, dumped from an MX25L6406E chip. That Macronix 64 Mbit (8 MB) SPI flash stores the boot ROM.
BIOS · 820-2828 · 3.35 MB · 5 Jun 2023BIOS rar3.35 MB - 820-3481-ABIOS · 820-3481 · 8.00 MB · 4 Jan 2024BIOS bin8.00 MB
- APPLE iMac 21.5 A1418 820-01061-A
Firmware archive for the Apple iMac 21.5 inch, model A1418, logic board 820-01061-A, packed as 4.27 MB RAR.
BIOS · 820-01061 · 4.27 MB · 5 Jul 2021BIOS rar4.27 MB - Apple iMac A1419 820-4652-A bios
BIOS firmware for the Apple iMac A1419, the 27-inch model, on logic board 820-4652-A. The ZIP archive holds an EFI ROM image for rewriting the SPI flash on the logic…
BIOS · 820-4652 · 4.62 MB · 9 Jun 2021BIOS zip4.62 MB - BIOS Apple MacBook A1312 820-2733-A
Firmware for the Apple MacBook A1312 logic board 820-2733 revision A, provided as a 1.61 MB RAR.
BIOS · 820-2733 · 1.61 MB · 3 Apr 2020BIOS rar1.61 MB - IMAC a1419 EMC3070 820-01134-A
Boot ROM firmware for an Apple iMac model A1419, EMC 3070, with logic board 820-01134-A, contained in a 4.28 MB RAR.
BIOS · 820-01134 · 4.28 MB · 25 May 2022BIOS rar4.28 MB - A1311 K74 051-8337 820-2784 TESTED BIOS
Tested BIOS dump for the Apple A1311 iMac, logic board 820-2784, with the name also carrying the K74 project code and the 051-8337 schematic number.
BIOS · 820-2784 · 1.67 MB · 5 Sept 2023BIOS rar1.67 MB