Ok so here is the progress:
1. made backup to PC.
2. copied the backup to a new 2Gb sd card. (using a card reader)
3. checked that it worked with the TT.
4. placed sd card back into card reader, deleted the file named system.
5. downloaded bootloader 5.5242.
6. copied the 5.5242 file called system the sd card.
7. placed back in TT and check that it worked. OK so far.
8. downloaded and extracted navcore 8562 to the PC.
9. placed new 8GB sdhc card in card reader, copied all the navcore content onto a new 8Gb sdhc card.
10. copied the 5.5242 bootloader into the root of the new sdhc card.
11. placed the sdhc card back into the TT and tested. got the screen that said "No Maps".
phase one complete. now to install the maps.



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