[Q] "this build is for development purposes only..." topic

ok guys im kinda new with the android system after using iphone long time...
i buy this phone from china and it shows me that error every time i turn it on.
first its comes with out the google store or any other google apps :/
when i try to download it, its collapses after i run it.

some technikal info i have =>
HTC ONE M7
android 4.4.3
htc 6.0
htc sdk api level 6.25
pi 4.38_003
prl 1

is there any chance that i can install a "normal" android virsion on this phone ? or its a real developers device that not designed for "normal users"


thanks a lot !