Modem not changing after flashing

Hi,
I was using RR 5.7.1 (based on CM13) for a while and noticed since I flashed it I had bad reception.
Now I realized that my GPS works horribly too. I've tried almost EVERYTHING, ranging from FasterGPS to changing the gps.conf and flashing a completely different ROM (Kushan and Omega, both based on TW)
I think the only thing I haven't tried is flashing another baseband firmware.
Well, I actually did, but the phone just wouldn't change it.
Odin claims it's a PASS but the firmware doesn't change in "About Phone" and reception stays the same.

I have a gt-i9505, I live in Israel and well, I didn't find a modem for my device and for Israel so I tried Global ones.
As stated, these don't work.
My current Baseband stays I9505XXYHOA7
No matter what I do, I can't get a GPS fix.
I typed *#1234# into the dialer to check my version,
it says the following:
AP: I9505XXUHOL4 (which is the modem I tried to flash)
CP: I9505XXUHOA7 (which is the modem I want to replace)
Any help would be really appreciated,
Thanks,
B1T3X