Okay, I have rendered my
NAV unusable!The screen is blank and I get no response from it whatsoever.
Here is what I did:
1. Made a patched disk version 4.2.01, updated the system to it and everything worked like a charm.
2. Then I got to cocky and made another version 4.2.02 where I have modified the text in the initial screen. The text in the nag screen that reads “IMPORTANT: Always obey traffic lows and pay attention to the road. Some features are limited…” It is located between 1:EDA0h and 1:EE50h in the MAIN.APN file. I took great care not to make my new message larger then the original one and that I used the Hex: 00 for return and Hex: 20 for spaces at the appropriate spots. I applied my new message to the MAIN.APN file in both folders (ZH2FF and ZH200) as well as incrementing the version in both locations.
3. The I inserted this new disk into my navigation.
4. First I got a “check the disk” error. But after reinserting the disk it started the install.
5. And that is where the problem started. After it finished install, it went right back to the beginning of the install and started the install again. It was stuck in this infinite loop.
6. So I tried to reinsert the 4.2.01 version in the nav. But all I got was the “check the disk” error.
7. So I turned off the key!
I'm pretty sure what happened here was you edited the text message, but then didn't re-update the checksums. The system wants to make sure there are no errors when reading in a new version of the program, and since you edited the program but not the checksums, it sees this as a read error and just keeps trying to reload.
If you want to change that text, you can do it, but make sure you adjust the checksums appropriately. One of these threads has a checksum program and the basic instructions on how to use it.
Okay, I got it working again. Here is how, in case anyone runs into the same problem.
I noticed that all the functions of the nav unit were working, I just didn’t see anything on the screen as it was blank. But the radio, cd, satellite radio… all were producing sound trough the speakers. So I went ahead and assumed that the only thing not working is the display (effected by me turning off the ignition key in the middle of the looping setup). With this in mind:
1. I went ahead and burned a new copy of the patched DVD and rolled it up to version 04.04.03 (one digit higher then the one that didn’t install successfully).
2. I put the disk in, waited for at least 10 seconds and then pressed Enter. Knowing from the previous installs that this is what you have to do in order to start the install. In my case I didn’t see the “Press Enter to Start Install” prompt as my display wasn’t working.
3. After I pressed enter a few seconds later the progress bar appeared and the new install went trough successfully!
That's great information. I wondered what the system would do if somebody ran into this problem. The blacking of the screen kind of sucks, but excellent that for yours it recognized the incremented version number and went through the update appropriately. Good find!
