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gestalt.exe
gestalt.exe
New Member
Last Activity: 12-08-2025, 06:22 PM
Joined: 11-27-2025
Location: Wallonia
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  • gestalt.exe
    replied to Lenovo Legion Y540 – Need help repairing BIOS after bad downgrade
    in BIOS Requests ONLY!
    i've just realized i might have mistakenly posted it on the wrong subforum (Bios /schematics instead of Bios request only sub forum) if it is not okay to post on this sub forum, do feel free to remove it, my apologies for this mistake
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    • gestalt.exe
      started a topic Lenovo Legion Y540 – Need help repairing BIOS after bad downgrade
      in BIOS Requests ONLY!

      Lenovo Legion Y540 – Need help repairing BIOS after bad downgrade

      Hi everyone,

      My Lenovo Legion Y540 (i7-9750H, RTX 2060) bricked after I downgraded from BHCN44WW to BHCN21WW.
      Laptop stopped booting entirely.

      I used a CH341A programmer to dump the corrupted 16MB BIOS.
      i then attempted the following:
      1. Downloaded stock BIOS BHCN39WW from Lenovo
      2. Trimmed it to 16MB
      3. Extracted the BIOS region from the corrupted dump
      4. Extracted the BIOS region from the stock 39WW
      5. Replaced the corrupted BIOS region with the stock one (within hxd , opened the corrupted dump and replaced its region by the stock)
      6. Injected back my LDGB / DMI
      ...
      See more | Go to post
      Last edited by gestalt.exe; 11-30-2025, 10:41 AM.
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