I have done the following things to my phone:
1. Upgrade from T-Mobile (NL) branded 4.3 to unbranded 4.4.2 (NL) using Odin, downloaded from sammobile. In the past I had installed a custom recovery and rooted my phone, but this was removed after installing 4.4.2.
2. WiFi did not work after this, so I applied a WiFi fix using Odin (I9505XXUFNB8-WiFi-FIX-(NON-HLOS)). Unfortunately I cannot find the original thread that describes this fix. If this is relevant I can search again. Wifi now works.
3. Factory reset (boot into recovery -> "wipe cache" and "wipe data/factory reset").
As described in other threads: All device administrators are disabled, nothing is encrypted and I have cleared credentials. I also tried removing my sim card, but the screen lock issue still persists.
When I boot into recovery it says:
-"Applied the CSC-code: PHN" (this used to be TNL when I still had 4.3)
When I boot into download mode it says:
-Product name: GT-I9505
-Current binary: Custom
-System status: Custom
-Knox kernel lock: 0x0
-Knox waranty void: 0x1
In About Device it says:
-Baseband version: I9505XXUEMKF
-Build number: KOT49H.I9505XXUFNB8
-Secure boot status: Samsung
The firmware information on sammobile:
I would like to know if there is a way to fix my screen lock issue. I suspect that my problem is caused by the wifi fix or the unbranded firmware because it still persists after a factory reset.