On an s4, I had tremendous problems with signal and gps after 4.4.2 update. In an effort to fix this, I rooted the phone and tried a custom rom. This did not fix the problem.
I then restored the original rom and deleted super user. The phone is back to its original state except that upon boot up, there is an icon center screen that says samsung unlock with a picture of a padlock that is unlocked,
This then goes away and the phone boots normally.
Any idea on how to get rid of this?
I used towel root to get root and loaded super user from the play store. This is a verizon wireless device in the US.