TOMTOM CT Move On Navigation - Lexus

Hi

Wondering, If anyone can help?

Currently have this Tomtom Navigation built in to my car.

It has the following:

Navcore - 9.891
Maps - Western Europe 915.5074

All works.

Then

I've tried adding new maps, the following:
Western Europe - 965.7250
Western Europe - 966.7372

Using FastActivate Activated the new maps. Had to create a new ttgo.bif as this unit doesn't create one to do this activation.

Once I add the SD card to my unit. All maps show as can't be used, even the ones that were working before. I have 2 backups which I can keep going back to so happy to tinker.

Any advice?

And have you patched the navcore ?
Fastactivate
number 3

Holyhead, unfortunately am struggling to do that. There is a ttsystem file which has been added by HOME to the SD Card to update the Navcore. The file format is simply 'ttsystem'. When I plug it in. It updates the navcore, once done it seems to get deleted.

I can't figure out how to open it and patch it. It is not recognised by 7zip which pretty much recognises any archive format.