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Thread: OS9.1 Checksum

  1. #1
    Question OS9.1 Checksum - Installation Tome
    I downloaded OS9.1 North American English, four times (4x) and it fails the checksum every time. Then I d/l OS9.1 International and its fine. Same with Italian.

    I finally decided to SKIP CHECKSUM process and install regardless. I get the error, could not find "Installation Tome".

  2. #2
    Thanks to Google + Internet, and then MacFixItForums and Appletechs for the answer. In case anyone else has this problem, and happens to find this post through a search. The problem may be corrupt data in your Mac's PRAM. Flash the Mac PRAM by retarting while holding the keys :

    COMMAND(Apple Key) + OPTION + P + R

    upon restarting your Mac. You will see a flash/flicker of the screen before the Mac logo appears, and then the the Startup Beep/Sound again, at which point you can release the keys. I downloaded the OS9.1 updater again (this may not be necessary) and this time no checksum nor Installation Tome Error. The Update ran perfect.

    Although I have not tried this, apparently you can "deep reset" the NVRAM and PRAM by using OPEN FIRMWARE upon restart with the keystroke combo:


    and then issuing a:

    #1) reset-nvram
    #2) reset-all

    The site says dont screw around issuing random OPEN FIRMEWARE commands if you don't know what you are doing, or you may F up your hardware. The above two (2) commands are supposed to be safe but other than that exercise caution.

    See the following links:

    Good Luck

  3. #3

    MacAddikt's Avatar
    Member Since
    Dec 30, 2002
    Sunny So Cal

    This will be a better home for it

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