Been asked to update an old Go700 (64mb.) with bluetooth facility.

In order to keep the bluetooth, what navcore will support it?

TT Home has updated it to 7.903, and that looks like as far as TT Home will go.

If it is not your device let the owner do it as your knowledge is too limited to do jobs for other people
Only mess up your own stuff, never stuff that does not belong to you.
You questions shows that you neither have a clue nor bother to inform yourself using all the infos provided in this forum.

Bit strong.

I've done my own devices in the past, successfully I may add, but never done one with bluetooth on it hence the question.

Than again you missed out as you should know BT is totally irrelevant when it comes to updating.
The offical NC is installed, and for everything else : It can work but there are no guarantees.