Hello chas521,
I just purchase a seconhand Mio Moov S505. I've unlocked it and installed yr iGO 8.3.5.183522. It works like a charm
Today I'm looking to install yr Garmin XT and Primo 1.1 on one SD Card like you.
According to your advice, I choose Primo 1.1. Did you change yr mind since then and you're using Primo 2.4? If so, I wonder it from yr device.
I really appreciate your help for any advices preparing this project.
Regards