Samsung alone is responsible for the variety of models and model names. The following models of the Samsung Galaxy A5 (2016) A510F are available:
A510F
A510F/DS
A510M
A510M/DS
A510FD
A510Y/DS
A5100
The /e/ documentation makes a clear statement:
Models Supported Models:
SM-A510F
Other models are not supported
PS. I have read your three postings here and here and here and am somewhat surprised by your observations and assessments.