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HumanDev228
New Member
Last Activity: Today, 03:02 PM
Joined: 09-11-2025
Location: New York
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Lenovo ThinkBook 13s Gen 3 ACN – Need Help Fixing Corrupted BIOS (W74M12JW)
Hello everyone,
I’m working on a Lenovo ThinkBook 13s Gen 3 ACN (AMD Ryzen 5 5600U) with a Winbond W74M12JW 16MB BIOS chip
Symptoms:- No display, fan spins, white LED blinking
- Temporary boot after flashing another BIOS
- Dies again after reboot
- Current BIOS dump appears corrupted (mostly FF-filled, no valid UEFI structure)
What I already tried:- External flash with CH341A + proper 1.8V supply
- Flashed GMCN33WW-031F.bin (booted once, then failed again)
- Reflashed original dump → same issue
- Power reset, battery disconnect
- RAM reflow attempt (no change)
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