I had a similar issue with my 2012 Explorer Limited, build date 8/11.
There are 2 different part numbers. EB5Z-19G490-A which is for the 2013-15 Explorers. It has different guidelines but is not compatible with the Park Assist Module on the 2011-12, which provides the colored visuals when you reverse.
Trust me I know.
There is also BB5Z-19G490-A. That part is only compatible with the 2011-12.
Im a big believer in junkyard parts. I sourced the EXPLORER trim from a junkyard with camera. It was a shot in the dark that it would work. It did but didn’t. It was out of a 2015. The guidelines worked, but no colored visuals.
In FORScan, you gotta clear out all the old DTC’s before running the module calibration.
Otherwise all the cheapo stuff is just Chinese knock off’s. Maybe hit or miss. Oddly the OEM Camera said “Hencho en China” on it.