I just found out a method to install good lock application in M series...
1) Sideload Good lock application from apkmirror
2)Install SAI from Play Store
3)Open SAI , and go to settings and enable 'Sign apk before installing'
4)Install good lock apk using SAI
5)Enjoy
Note:-
1)You can also install good lock modules in the same manner..
2)Some modules like Routines won't install bcoz they have android:shareduserid="android.uid.system"
For which signature verification is essential
3)Modules like Clockface and Notistar work perfectly after providing necessary permission
4)Modules like Themestar require additional permission via adb
apk is installed but there is no modes showing up ?
