I received a 2013 Macbook Air A1466 820-3437-B motherboard with serial number C02L6GQ9FSV8 that came in WITHOUT a bios chip. I got a new bios chip and reprogrammed it. Macbook now powers on but doesn't boot the SSD. I've flashed a ton of bios but still same problem. Windows installation works with this Macbook but never a mac installation. Unfortunately, since I didn't receive this macbook with a bios chip, I don't have the original bios. What can I do now?
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Where did you source the donor BIOS from? Use the Mac EFI toolkit on your BIOS to find out version number, APFS support etc. Latest version for this board is 478.0.0.0. You can use this tool to clear the NVRAM stores too rather than doing a PRAM reset via the keyboard.
Don't bother using Internet recovery on these old machines. Just create a USB installer of Big Sur (that is the last official build supported on that board). If what you are using isn't APFS enabled, you must format the SSD as MAC OS Extended in Disk Utility. The installer should update the BIOS to current version and then convert the volume to APFS.
https://www.badcaps.net/forum/troubl...ac-efi-toolkit -
Got this to work by serializing the bios. Everything works well nowComment
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Hello everyone,
I’m currently working on a dead MSI GP75 Leopard (MS-17E71) motherboard (i7 CPU, NVIDIA GPU) with a no display/no backlight issue initially. After extensive investigation, I’m at a critical stage involving EC firmware, BIOS/ME region interaction, and possible deep corruption. I'm seeking advanced insight from anyone with experience in EC/BIOS sync issues or PCH-level behavior. Here’s a full breakdown:
🧩 Initial Issue- Board powers on (fans spin, keyboard lights up and can be adjusted, caps lock led lights), but no display or backlight
- External display (HDMI) shows
07-24-2025, 02:17 PM -
I HAVE A MACBOOK AIR A1466 820-00165-A THAT IS BIOS LOCKED I WAS ABLE TO DUMP THYE ORIGNAL TO UNLOCK IT AND ION THS PRFOCESS MY CAT GOT ON MY KEYBOARD AND WAS ABLKE TO ERASE THE CHIP ASND THE FILES I HAD SO IM STUMPED. I HAVE A COUPLE BIOS THAT IVE DOWNLOADED AND CHANGED THE SSN BUT WE
HEN I FLASH THEM TO CHIP AND TRY TO BOOT THE MACBOOK NO FAN DISPSPLAY. BUT IT STILL CHARGES AND IF I PUT MY USB VOLT METER SHOW 5V AT USB WHENJ I POWER IT ON. IM STUMPED.. -
I HAVE A MACBOOK AIR A1466 820-00165-A THAT IS BIOS LOCKED I WAS ABLE TO DUMP THYE ORIGNAL TO UNLOCK IT AND ION THS PRFOCESS MY CAT GOT ON MY KEYBOARD AND WAS ABLKE TO ERASE THE CHIP ASND THE FILES I HAD SO IM STUMPED. I HAVE A COUPLE BIOS THAT IVE DOWNLOADED AND CHANGED THE SSN BUT WE
HEN I FLASH THEM TO CHIP AND TRY TO BOOT THE MACBOOK NO FAN DISPSPLAY. BUT IT STILL CHARGES AND IF I PUT MY USB VOLT METER SHOW 5V AT USB WHENJ I POWER IT ON. IM STUMPED.. -
Hello everyone,
I recently bought a non-working Asus Zenbook Pro Duo OLED UX8402ZA that was listed for parts only. The seller mentioned that it had no display output but that the charging lights worked.
When the laptop arrived (without a charger and SSD), I connected a charger and confirmed with a multimeter that it was charging the battery. However, when I tried to power it on, only the backlight of the secondary display came on. There was no image, and it didn’t boot into the BIOS.
I decided to try flashing a new BIOS, but since I didn’t want to desolder... -
First of all thanks to all of our members who have posted previously all methods posted here.
Please leave a comment if you find something new,or have anything else to add.
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