How can I update a fake samsung galaxy s5?

A

AC Question

Several years ago I purchased a fake Samsung s5 and I ended up just getting a different phone and not using it.

Recently I tried installing Pokemon GO on this phone and it unfortunately is not compatible. Also, for some reason I only have about 500MB storage space available even though I have like 2 apps installed and have hardly touched the phone. I know it's a fake, so maybe there actually is virtually no space?

Does anyone have experience with installing a new version of android on a fake s5 so I can install Pokemon go on here? Someone had mentioned on another forum that after installing cyanmod 13 on their phone it had worked