Would like to have AOSP lock screen on your phone? It's working fine and stable on Sweet ROM. It should work fine for 4.1.2 ROM.
3. Google Search
Tested all working good.
Would like to have it? Download AOSP Lockscreen here.
1. Xposed Framework
AOSPLockscreen_1.1.apk and you will see it in the Xposed Installer. Check It to activate and Reboot. DONE!
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