A quick recap for those coming here in the future to upgrade their head unit to version 7 firmware, 2017 maps, and the latest Bluetooth version. A special thanks to RonS for his help!
Quoted from an earlier post of his, “This is a hack to prepare your unit to install a map/firmware update. Confirmed to allow firmware updates for all Z110, Z120, Z130, Z140, X920, X930, X940 - and probably their corresponding rest-of-the-world units. I can't say whether it will work with the very old units, and it won't work with the model numbers ending in 50 or greater, or Nex units.