In the DC universe (and multi-verse), Parademons are Darkseid's personal troops for conquest. Although various descriptions have been provided about them across the Internet, one thing is common:
Parademons are sentient species captured and genetically modified by Darkseid's scientists to serve Darkseid's will.
They have been known to show several abilities, including super-human strength, capability of flight, etc. (both in the comics and in the recent Justice League movie).
My question is: When certain beings (human, alien, or otherwise) are turned into parademons, do they retain any abilities they possessed before? For the sake of an example, lets say that The FL was turned into a parademon. Would he still retain his super-speed and the connection to the Speed Force?
As there is very little information about the parademons in the Justice League movie, I base my question purely on the DC comic books and the DC animated versions.