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Thread: MCS2000 Serial number change > FAIL 01/82

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    Default MCS2000 Serial number change > FAIL 01/82

    Dear friends,

    I' tried to change serial number of MCS2000 via editing s-rec file.
    I changed the serial at internal & external locations and corrected the checksum at the end of the line.
    After programming I have got FAIL 01/82.

    What I did wrong?


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    Trying to change the s/n would be a start.

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    First of all, there are 2 instances of the S/N you have to change. Second, there are block checksums for both the blocks containing the S/N data, and those need to be re-calculated after the changes have been made. There are lots of articles on here about editing data in the system blocks of the Astro and Astro Spectra series of radios, they all apply to what you are trying to do as well. You need to do a LOT of reading and searching to master what you are trying to do!

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    The OP got an answer somewhere else. It just struck me as weird he wanted only to change the s/n.

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    Quote Originally Posted by Notarola View Post
    The OP got an answer somewhere else. It just struck me as weird he wanted only to change the s/n.
    In the past I've had to recover MCS2000's with an Srecord from a different radio. It's not strictly necessary but it bothered me that the SN didn't match so I've hex edited just the SN before.

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    I have found that for the first few blocks the checksum seems to be off by a value of 0x55. Later blocks, such as for zones, have a normal checksum. If you hadn't given up already, it's worth a shot to add 0x55 to your proposed value.

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    Sorry, to clarify, I am referring to the block checksum and not the end of line checksum of the s record. The block checksum you want to adjust is at 0x250

    Add up all the bytes from 0x200 to 0x24f. Then subtract 0x55. Take the last two characters into position 0x250. And then finally fix the s record end of line checksum.