BIOS file larger than chip?

Discussion in 'BIOS Mods' started by pruhster, May 16, 2011.

  1. pruhster

    pruhster MDL Novice

    May 15, 2011
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    Hello,
    I ended up with a bricked Clevo w765cuh. When I turn it on only the power lights and fan start, but no monitor backlight so I assume it's totally dead. I tried taking the bios chip out and reprogramming but the official bios update file ( fXp://cftp.clevo.com.tw/ALLBIOS/WM7xxCUH/BIOS_11.zip ) is several KB larger that the chip capacity (4 MB and a few extra bytes). I tried writing it partially from the beginning but that didn't work. Any idea where I have to cut manually or if there's a way to generate the actual part that's written to the chip?

    Thank you.
     
  2. zahnoo

    zahnoo MDL Senior Member

    Feb 2, 2011
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    What do you believe bricked your computer? I'm assuming a failed BIOS flash but you don't really say. You may have a battery failure. Have you tested the battery or tried to power up the unit using only the charger?

    I think the first thing I'd do is re-flash the previous BIOS to get back to the original OEM working state and then call the maker and get their take on your problem. The last computer I worked on that had socketed chips was an Apple III and that was in the early '80s. But then I have zero experience with Clevo machines. Did you de-solder the chip to remove it? What equipment are you using to write to the chip outside the computer? Are you protected against static electric discharge? That can ruin a whole host of electronic parts and devices.

    I don't think a partial write is going to get the results you want. If the BIOS chip is too small to hold the data you want to write, I'd think you're trying to flash the wrong data set. That or the chip is damaged if the BIOS is the correct version. Or maybe the BIOS file itself is corrupt. Download and try again with a new file maybe.
     
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  3. pruhster

    pruhster MDL Novice

    May 15, 2011
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    Flashing the wrong bios was what bricked the laptop. Now I'm trying to put back the original one, from the manufacturer's website that I'm certain works with the computer. However the file itself is larger than the bios memory. I assume that the flash update tool doesn't write the whole file on the chip but I'm not sure which part is what I need. I can't use the flash update tool because the computer won't boot at all, even though power works fine. I'm using a ELNEC SEEprog.
    I ran into the Phoenix Mod Tool in my search for something that would make sense of the file and it seems to read it correctly, but I still have no idea which part to use, so I was hoping people with more experience here might have some idea.
     
  4. tqhoang

    tqhoang MDL BIOS Modder

    Apr 29, 2008
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    The BIOS "W760CUH.11" is the BIOS.ROM + Platform Data. Here's a couple threads on the subject.

    http://forums.mydigitallife.net/threads/21168-Toshiba-bios-via-SPI?
    http://forums.mydigitallife.net/threads/6447-How-to-get-Acer-Bios-.rom-from-.exe?
    http://forums.mydigitallife.net/thr...ract-the-bios-update-from-a-.EXE-file-for-LG?

    But, I took a peak at yours and the "NAPI" string doesn't appear to be in the middle of the BIOS. What you should try is to figure out the correct size of your memory chip and "cut" that from the beginning of your BIOS file. The "NAPI" string should be a multiple of 512kB (80000h) away from the beginning of the file.

    Also I'm not a hardware guy, but you might actually need a different EEPROM programmer...according to the first thread I linked. Good luck!
     
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