well, this is getting a bit frustrating, and I'm burning through lots of CD's

fortunatly, I've got another 50 or so

ok, I've done exactly as you described above, even have downloaded MajicISO and am now using it instead of UltraISO or the others...

so, I opened up the v28.mdf file in MajicISO, and extracted the navboot file to a safe place. I then edited the navboot file in Navtweak, and dragged it back into the same directory location within the still open v28.mdf file in MajicISO. It copied over the old version, no problem

Then, just as you suggested, I did the same thing with the two *.tbl files and changed the 3030 to 3031, saved them and dragged them back into their respective positions again in the still open MajicISO

ok, so now its time to write the whole thing out to an ISO file

when I tried buring it directly to a CD it asked for an existing ISO file to burn

well, ok so I just took what I had opened and saved it as a new ISO file

then burned that ISO file to a CD

when I insert this into my navigation computer on the car, (just as instructed, key in position one, and all that), it takes it and begins crunching away, it says its updating the system....after a minute it comes up with the message

DEFECTIVE CD

I'm stuck