It's Christmas, and all mine may have come today...
Top-Left: That guy's hacked file.
Top-Mid: The other guy's unhacked file.
Top-Right: Sumitomo's 20MB file, string tracked down, code to change identified.
Bottom-Left: file compare details (what to search for and replace) - Theirs vs mine.
The screen in my car (well, it clearly wasn't today!!) has a newer firmware (and lots of FPV stuff the other SAT NAV unit doesn't have) but you can still search for the 8 bytes (you find it once only in the file) and replace what's on the left with what's on the right.
(Sorry about the large image, I've got a 40" 4K computer screen)
I used these lines to copy (and keep the old) maps over.. I cd /fs/usb0 and run the commands from there - where I've copied the bits and pieces needed:
#Delete any really old maps (never happens the first time)
rm -fr /packages/factory/navi_maps/root_dir/usr/navngo/MobileNavigator_o
#Update the NAV files keeping a copy
mv /packages/factory/navi_maps/root_dir/usr/navngo/MobileNavigator /packages/factory/navi_maps/root_dir/usr/navngo/MobileNavigator_o
cp -LR MobileNavigator /packages/factory/navi_maps/root_dir/usr/navngo
#Copy over any extra licenses (here I pick SWSA* just so I don't copy anything else and clobber any other of my good files)
cp /packages/factory/navi_maps/root_dir/usr/navngo/MobileNavigator/license/SWSA* /packages/persist/root_dir/usr/navngo/MobileNavigator/license
#Keep a copy of the original exe file, put in the hacked one
mv /packages/factory/navi/root/usr/navngo/MobileNavigator/sumitomo_sw-qnxarm-release /packages/factory/navi/root/usr/navngo/MobileNavigator/sumitomo_sw-qnxarm-release_o
cp sumitomo_sw-qnxarm-release2 /packages/factory/navi/root/usr/navngo/MobileNavigator/sumitomo_sw-qnxarm-release
Went to start up with the maps copied but before I copied the hacked exe over.
I got the following log output over and over and over, then copied the hacked exe and restarted and it all worked..
Ham: Entity "igo_starter" with pid: 917560 died
Ham: Restarted: /etfsRoot/usr/navngo/MobileNavigator/igo_starter
Lots more licenses now:
Updated maps running fine:
I've extended the two wires down to the tissue holder in my car, so I can get to them by just pulling that out next time.
I should mention you need to use the cigar lighter socket for a ground to the laptop!
Now that I've got complete backups of my 3 working units, I'm far more confident that I could recover from the blank screen problem now.
It would only be rare cases when critical files became corrupt - and it's probably just what certain companies are doing to recondition them.
Maybe I should now wrap up my two working spare units in sealed bags
Thanks guys, for your support. (And Merry Christmas again!)