View Full Version : OS9.1 Checksum

12-11-2003, 11:30 PM
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".

12-12-2003, 02:58 AM
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

12-12-2003, 11:17 AM

This will be a better home for it