I've followed all the instructions AFAIK on the 'Latest SE TRUCK NAVCORES for other devices' thread.
I downloaded The map 880.3845, added the ttgo.bif file from a back up, cracked the map on the computer using Fast activator. I got both a meta.dct AND a tmeta.dct. Overwrote the system file.
Then copied the lot onto a 4gb SDHC card
When I insert the card and turn tom tom on it just loads up the tomtom black screen, then the picture of the device and the computer hard drive logo and the loading up yellow and blue processing lines, then it goes back to the tomtom Go secenery black screen then a black screen, then the tomtom black screen, then the the computer hard drive logo and the loading up yellow and blue processing lines and carries on this sequence time after time.
I know I have the 5.5120 boot already running from past unsuccessful attempts.
Is that boot version stopping it reading the card?
I deleted the card and copied all the original backup to it. Then deleted all the internal memory.
Then put the card and in and whoosh it has booted fine.
So it seems the bootloader and the card are working okay.
So not sure what to try next.
I'm sure I'm doing something wrong.