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[Q] LG C800 [CM9] "Baseband unknown" Stock baseband won`t flash.

I`ve got an LG MyTouch Q (C800) which was network locked to T-Mobile, i`ve flashed the latest nightly CM9 (doing everything by the instructions), and now the phone can`t connect to any mobile networks. Looking for a solution i`ve found that you can flash a stock baseband to solve this, but everytime i flash this stock baseband image through CWM recovery nothing changes - no network connections and baseband still shows "unknown". IMEI is the same as on stock ROM.
Removing the sim card doesn`t bring "emergency call" option and there is no "no sim card" sign in the tray, and the phone acts like it has a sim card in it when trying to connect to a mobile network it says that "Unable to connect to this network at this time. Please try again later".
Flashing back to stock ROM solves the problem - i have a baseband number and emergency call works but the biggest problem still exists - it`s network locked.
So the question is:
Am I flashing correctly this stock baseband through CWM recovery or I am doing everything wrong?
P.S.
I can`t post in the thread http://forum.xda-developers.com/showthread.php?t=1752704 and instructions on stock baseband flashing were sketchy at best.

No one knows? Please guys\gals help, it`s driving me nuts that I can`t figure it out how to flash this baseband.

Baseband unknown but I have IMEI, Mobile DATA, WiFi, etc.

Flashed from CM 12.1 to 13 last night on my wife's OPO via lastest TWRP.
Baseband says "Unknown" but I have IMEI, and phone functions normally.
Any way to fix the baseband?
TIA

Update the Modem/baseband Firmware*

I successfully installed a CM13 ROM for a different variant than my phone. Installed ROM jfltexx variant intended for a Gt19505 model S4 on an i337z S4. It worked and now the device model in phones settings shows listed as GT19505.
ROM works fine, phone dialer functions but I read that I should update the radio firmware. I have had a call or two drop off with no ringing sound but call is apparently going through but I can not hear person on receiving end.
So what baseband modem firmware do I update to? The true hardware i337z or the GT19505 that the phone is working as? I went from Kit Kat 4.4.2 to Marshmallow 6.0..
Baseband Version after installing CM13 jfltexx remains the original i337ztuuboa3. Everything else has changed to reflect CM13 ROM. Build, Kernal etc.
I'm baffled so any help would be greatly appreciated.

I'm suffering the very some issue and few others.
Just noticed that my present baseband is I9505XXUGNF1.
I've downloaded the I9505XXUHOJ2_I9505ITVHOJ1_ITV nd extracted both modem.bin and NON-HLOS.bin and flashed using Heimdall on OSX via cli.
But the phone is still reporting the old BB number.

You need to flash i337z model's RIL files & Modem. Don't know where you will get that but that's what you need to flash for sure..
rivnyak said:
I successfully installed a CM13 ROM for a different variant than my phone. Installed ROM jfltexx variant intended for a Gt19505 model S4 on an i337z S4. It worked and now the device model in phones settings shows listed as GT19505.
ROM works fine, phone dialer functions but I read that I should update the radio firmware. I have had a call or two drop off with no ringing sound but call is apparently going through but I can not hear person on receiving end.
So what baseband modem firmware do I update to? The true hardware i337z or the GT19505 that the phone is working as? I went from Kit Kat 4.4.2 to Marshmallow 6.0..
Baseband Version after installing CM13 jfltexx remains the original i337ztuuboa3. Everything else has changed to reflect CM13 ROM. Build, Kernal etc.
I'm baffled so any help would be greatly appreciated.
Click to expand...
Click to collapse

Thanks. I'll search around. Problem with calls is few

Few. I say 5 % of time usually when I'm going from one area to another so I'm not certain I want to mess up phone. Couple of questions, I am using latest modem for phone as far as I know, bought it in Oct 15,and Cricket has no new update beyond 4.4.4. Are you positive it will not mesd

To flash should I use existing TWRP recovery, Odin. for those file types? I'm guessing Odin.
Once again thanks for your help

Emergency calls only marshmellow

need urgent help I flashed the btu marshmellow now my phone says emergency calls only

I have the same problem, although for me it wasnt that I flashed a new rom, just woke up and my phone wouldn't connect to the network. I have done an IMEI check as I bought the phone second hand and it came back clean
my IMEI is nornal so my EFS isn't dead, anyone have any thoughts? I have flashed stock throguh Smart Switch and still the problem is here

Same issue from last week
I was using 60.1 extra lite rom but when I updated to Nobel rom . No sim card emergency calls only issue
Please experts give us the salution

For incoming calls on airtel , internet changes to 2g (earlier volte+4g)

I am observing this issue from one week. I am on MIUI 11.0.8 , India region.
Is it happening due after latest MIUI update? can i revert back to miui 11.0.5?
I have revert back rom to miui 11.0.6 but still I am facing same issue.

There is not issue for outgoing call. Network remain stable at volte.

Finally got the root cause.. it's temporary problem from network..we can't do anything for it. It happen sometimes .. just wait for to get it fix.