Ok, if you can still get this info your device is fine.
The bootloader is too old for newer Navcore and won't support SDHC cards.
I suggest to use the 5.5012 or 5.5128.
[Only registered and activated users can see links. ] [Only registered and activated users can see links. ] [Only registered and activated users can see links. ]

Unpack the archive to the root of your device / SD and reboot the TT.
You will see a short warning screen not to turn off - the BL is being installed.
After that you can use a V9 Navcore and SDHC SD cards.
I suggest you check my 9.485 for most devices - the version with Memory boost will suit your device, is patched and gives support for the latest maps.
A general how-to is in the thread, so read it carefully.
For the new map unpack the files to your device / SD into a folder , make sure the files don't end in a subfolder.
Be careful and check if for the map of choice a meta code is already available!
E.g.: /maps/Europe east/mapfiles would not work.
Use the lates version of FastActivate for the map, the _NC is ready to go.