How do I remove unwanted mods on my Zenfone 5 which I installed, when they create some problems?

[AC Question]

how remove unwanted mods on zenfone 5 which i install, when they create some problem?

i install multi user mod on my zenfone 5 it works fine but on main user it not work and says "system ui has stopped working". i want to delete it. but it disable command also does not work.i want my system as prev in lollipop update factory reset not work.i remove data and cashe also.please help.