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Thread: P1900 firmware.. help needed to edit firmware

  1. #1
    FreeDrive Creator CdRsKuLL's Avatar
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    P1900 firmware.. help needed to edit firmware

    I am trying to edit the latest firmware so it doesnt shutdown when I'm using a car battery charger.. This is how far I've got..

    Download the latest 2.8 Firmware HERE

    Memory Locations and values are HERE

    Now I have loaded it into a HEX editor but I cant seem to make the values match. In 2.8 it says the Low Battery Threshold is stored at 0x0064 , so I goto that place and I would expect the value 'EE' but I find '33' so I'm a bit lost. Anyone care to lend a dummy a hand.. ?

    Ta

  2. #2
    Maximum Bitrate americasfuture2's Avatar
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    how do you update the firmware? i dont remember seeing any usb or rs232 connections at all. or remember reading anything that says how to do so.

  3. #3
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    The file you're editing is a HEX file which is an ASCII representation of a binary file thats commonly used for programmers and such.

    So when you're look at 0x64 in the HEX file, its the wrong place, you have to convert the .HEX file to a .BIN file, use hex2bin, there is one on sourceforge, edit that binary file, and convert it back to a .HEX file.

    However i converted that file to a .BIN and looked at offset 0x64 and its 0x0319, so it still seems wrong, their docs are a little odd.

    But if you look for 0xEE 0x30 you'll see it only exists at 0xC8, and the docs list 0x30(C9) but oddly in the 2.4 revision table, and if you look at the 2.8 revision its 0x30(EE)

    so i think the docs are screwy.

  4. #4
    Maximum Bitrate americasfuture2's Avatar
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    Quote Originally Posted by americasfuture2 View Post
    how do you update the firmware? i dont remember seeing any usb or rs232 connections at all. or remember reading anything that says how to do so.

  5. #5
    FLAC Machinehead's Avatar
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    The Carnetix support forums are your friend; http://www.carnetix.com/firmware/UFlashInstructions.htm

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