Security settting hard bugs

[makayama]

Describe the issues:
when user try to access security in settings he face force close Message
so any user can't enable unknown install apk app .

1- solution not sovle the problem after testing :
You need root for this solution
Open a Terminal Emulator (If neccessary get it from Play Store for free)
type "su" and answer permission dialog from SuperSU or SuperUser
type "mount -o rw,remount /system" exactly as stated here including the spaces -> followed by enter
type "cd /vendor/firmware/keymaster" -> followed by enter
type "chmod 0644 *" -> followed by enter
You may have to restart your phone.

2- command line using terminal to enable unknown install apk app .

3- Expected solution :)
Is to flash system.img for cm12.1 lollipop through twrp recovery through multirom
many users have positive result for fix these problem in xda:
http://forum.xda-developers.com/showpost.php?p=38058099&postcount=8

[makayama]

Solution:
by enable non-market installer apk to true
the problem solving , but for security settings keep force close releated to rom lollipop bugs in oneplus .

sub problem :
some apps or games need permission for adjustment brightness to make install happen, it take me long time to install some apps and games ,i try many time to install it by press install button but nothing work so these link helps me 👍 http://android.stackexchange.com/questions/82155/why-cant-i-install-this-downloaded-apk

the solution for sub problem:+1:
i fix my brightness screen from low to high than magic begin you see your apps/games begin install with "install button" that do the tricks.

[makayama]

not fixed due to hard bugs from cyanogenmod
alternative we make flash zip to enable install unknown market app apk