why are my andriod apps not working

[AC Question]

Hi all, my android apps are not working, only a few apps are, I cant voice call(no dailer), I can't msg, I cant sign in to google. It keeps popping different msg saying; unfortunately google apps has stop working, or unfortunately google service has stop working or even I try to open an app like instagram, it says unfortunately Instagram has stop working. But some other apps do work like xender, whats app, uc browser etc but apps that comes with the phone doesn't.
I have done hard restes/factory reset nothing seem to work... Pls help thanks

 

[belodion]

What device? https://forums.androidcentral.com/showthread.php?t=409154

 

[ficson]

Well its a costome build tablet, it uses android 4.4.2
Custom build version 2.26_20150307

 

[ficson]

Anybod please, really need help here

 

[ficson]

Hello! Anybody?