Sync 3.4 Black Screen

DO NOT use the reformat tool (1U5T-14G386-CB.TAR.GZ) on MY20 and newer vehicles!

MY20+ will exhibit a black screen if the reformat tool is used. The screen drivers are the issue and are not supported by the reformat tool above. There is a fix that seems to work in some cases. You will need a previous MY19 or older Sync 3 screen.

NOTE: This procedure is not guaranteed to work, and you are responsible for your actions. This is posted for information only.

In summary: 
1. Change the screen to an older one, force reset the APIM with FORScan and power cycle the APIM. 
2. Fix the install and update as usual, then…
3. Change back to MY20 screen and force reset the APIM with FORScan and power cycle again to make it work.