2015 bt50 upgrading head unit for ExplorOz display

That unit appears limited to CarPlay/Android Auto only and does not say it has access to the Google Playstore so you would also need to buy an Android Interface Adapter. This is explained on our ExplorOz Traveller webpage. Id suggest you contact Smartworld - theres a link there. They are our partners for this solution - he will guide you to the best options. They are in Sydney. You could spend $350 instead of $1600!

I have a 2018 BT50. I purchased a head unit that did everything - music, radio, street and Hema navigation, rear camera display, and 5 years later it blew a capacitor and had to throw the whole lot away.

I would recommend that you don't get an all in one solution and separate the various components. For example, just get a basic head unit to play music/radio/blue tooth to your phone and a usb input for stored music; use a tablet for off road navigation (ExplorOz) which allows a 12" screen (so much better than the 7" screen from a head unit), and then use your phone or dedicated GPS for turn by turn navigation. This setup provides a lot of flexibility - easy to update apps with latest software and maps, and if one bit breaks, the rest will keep on working.

You do need to plan your dash so that you can safely mount everything.