Zenfone 5 (A501CG) trouble after misusing Titanium Backup topic

So I rooted my Zenfone 5 and used Titanium Backup to manage system apps and then I used the option to convert the updated version of some system apps to rom. When I did that Google Play services and Play Store started crashing. I can't find a way to get it back to normal since I didn't back it up so I tried restoring stock rom but I couldn't install TWRP recovery, it says it's signed or secured, something like that.
Help please :crying:

PS: Zenfone 5 doesn't have a forum so I figure this was the best place to post it.