Lenovo Legion Y540-15IRH BIOS Recovery

Hello everyone!

My friend bricked his Lenovo Legion Y540-15IRH by shutting it down, I tried to download the latest bios and program it but the bios file is bigger than the bios chip.

So I found some steps for a Lenovo Y740 to grab the bios region, I tried to write the bios region to the chip, it fitted the bios chip, but the machine does not boot and is doing less than before. I don’t know what I’m doing but perhaps the bios requires additional modification?

Serial Number:PF1S6Q0N
Machine Type Model:81SX007YMH
Original_unmodified_bios.bin.zip (5.7 MB)

I’m hoping someone could help me out!


Someone who backed up the broken bios before trying to write something- very good!

Your update process from CN41WW to CN44WW stopped after updateing EC firmware within the first EFI volume of the bios region (1FD0BACE-6F0A-4085-901E-F6210385CB6F)

Original_bios.zip (5.4 MB)

Changed EC firmware and this volume back to CN41WW, try if this works…

Hey @lfb6

Thank you so much, it worked!

Could you tell me where I can learn more about the fix? It’s really abracadabra for me and I’d to expand my knowledge on firmware, it’s really interesting!


Thanks for the feedback- good to hear it worked.

There’s no guide for this kind of fix, you need to find the bios versions, UEFIToolNE for the structure and a hex editor to compare the files and to find out where changes were made/ stopped.