[HELP] Derped by new Z3 (or maybe it's SIM Locked)

I broke my Z3 and got a replacement a few days ago.

After I flashed pre-rooted 23.4.A.0.546, linked here, the he replacement shows the dreaded Invalid Card. Emergency calls only:

I never tested the device, I went directly for the root, ZX discovery and pre-rooted flash.

As quick explanation:
I got the device.
I never inserted a SIM, I immediately followed the instruction to root a Z3 with a locked BL:

- downgraded phone with D6603_23.0.A.2.93 ftf linked here.
- ran giofroot exploit. used v3.1. had to run it twice.
- mounted /system rw with ES Explorer.
- installed Z3 Dualrecovery for locked BL.
- then flashed 23.4.A.0.546 linked here.

Phone turned on without a hitch.
When I placed the SIM, I noticed the Invalid Card notice.

Tried (and failed) attempts:
Since then, I've rolled back to D6603_23.0.A.2.93.
Installed PC Companion (eeew) and done a system repair.
Downloaded the latest firmware from xperifirm for Telcel's branded ROM.

nothing. device still says Invalid Card.

a few screenshots that might help someone get a better understanding of what happened;




can anyone confirm if I have a SIM-locked device or if I flashed the wrong firmware?
How can I roll back? what measurements can I take to better understand the problem?