Re: Toyota Yaris 2013 Touch and go upgrade NO NAV to NAV?
Hi. Unfortunately it's not just firmware.
To upgrade Toyota Touch to full Navigation you need some hardware (original GPS Navigation Module). This hardware can be purchased from Toyota Dealer.
For Example to convert your System to "Toyota Touch & Go" you need Block with PartNr. PZ490-00331-00 (costs around 800€ officially)
To Convert to "Touch and Go Plus" (Same as Go but + 3D Mode, Text to Speech Google search etc) you need PZ490-00332-00 (~1000€)
You don't need to change the Head Unit - just add a box, like one shown on Ebay. The installation instructions are available for free on Toyota Service Information
Currently there are some 3rd party navigation module becoming available for T&G. If you need I can give you some links. They cost about 400-500€, but have much more features - for example Video, free choice of Navigation Software etc.