MBA4,2_BIOS_v0077_B12.zip

TXTAbout MBA4,2 BIOS v0077 B12 BIOS / EC firmware

MBA4,2 BIOS v0077 B12 is an Apple MBA4 / v0077 / B12 BIOS / EC firmware dump for board 820-3023-A. It is packed in a ZIP archive of 3.7 MB. It was first posted on 30 Jan 2019 and is available in 2 Telegram channels.

Write it with an SPI programmer such as CH341A, RT809H or XGecu T48 to revive a board after a failed BIOS update, fix a corrupted Intel ME region or remove a forgotten BIOS password. Read and save the original chip first, and check that your board is 820-3023-A.

For the same board you can also find a boardview and a schematic — see all 820-3023-A files.

MSGFrom the Telegram post

BIOS for Apple MacBook Air4,2 (Mid-2011), A1369, EMC2469 MLB 820-3023-A MBA41.0077.B12 (2015-001)

J1Download 820-3023-A BIOS / EC firmware from Telegram

R1How to download MBA4,2 BIOS v0077 B12

1. Press Download in Telegram. The post opens in the Telegram app, or on a t.me preview page — choose “View in Telegram”.
2. You don’t need to join the channel. Tap the file MBA4,2_BIOS_v0077_B12.zip to download it.
3. Open it with Built into Windows and macOS or 7-Zip (free).

If a post was deleted, try another source above or search for 820-3023-A. Step-by-step help: downloading from Telegram.

Back up the original chip twice before writing this dump, and check that the board number and chip size match. See how to flash a BIOS chip.

.ZIPWhat is a .zip file and how to open it?