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Baseband Unknown on MK2 based ROM

Hello everyone I have a weird issue here and I am in need of some help. I was running a stock MK2 rooted rom, with the modem/firmware MK2 with the MF9 bootloader. When the first NAE (4.4) ROM popped up I decided to give it a try and installed it without getting the NAE modem first. The ROM wouldn't get past the splash screen and other users experienced this too, I figured I should get the NAE modem so I installed it and rebooted hoping it would get past the splash screen. I came to a conclusion that it probably isnt going to work right now so I did a nandroid restore back to my stock MK2 ROM. Upon booting it up I had no data, signal bars with a red X and in About Device section it says baseband unknown and in the status section everything is unknown or has no field. I thought my modem was broken so I tried a 4.4 kitkat ROM OctOS which worked perfectly and I got signal on that ROM. So this brings to me another hypothesis that my modem is fine as I could make calls and what not, no issues. However I tried reinstalling stock MK2 and for some reason I get no signal...
I am not sure whats going on here, I tried a MF9 Stock Tar and formatted the whole phone, tried installing MK2 and MF9 modem and I get no signal on the stock MK2 ROM. I am a little lost here and asking the XDA community for help, I really want to go back to my old setup. Please help me out here.

My situation is kinda similar to yours. I also had no service and got an Unknown baseband message in Settings when I went from stock rooted MK2 (with stock MK2 kernel and MF9 bootloader) to the new NAE ROM and NAE baseband.
I suspect that NAE requires a Knox bootloader for service to work.
Anyhow, to go back to a fully functional MK2 state, here's what I did:
1. Restored my MK2 Nandroid using Philz's recovery.
2. Booted directly into Download mode from Philz and flashed back the MK2 modem with Odin 3.07.
3. Rebooted phone and everything fully works again.
Sent from my Nexus 5 using Tapatalk

modem didn't stick maybe?
Had issues playing with the new modem and nae ROMs. Unknown baseband and no days. Even a ##72786# led to a blank screen with no option to reset. So I played around with different install techniques and got a ROM to fully function.
Unknownforces stock rooted nae. From android development forum.
1. Clean to install new ROM using Philz 6.0.8.9(what I used) said any can be used
2. Even of you have already flashed new modern do it again now
A. Power completely off
B. Go into download mode
C. Odin new NAE modem(auto reboot and freset unchecked)
D. After Pass reboot into recovery
3. Clean wipe for new install
4. Install unknown forces ROM
5. Reboot and enjoy data working and WiFi working

Whoops

I was attempting to revert to stock from pac rom 4.4.2, and made the mistake of attempting to flash 4.3 stock fw via odin. Obviously it failed. Flashed my custom recovery back thru odin and recovered a nandroid. Everything is working, wifi, data, lte...but no sound. Zip. Not even in calls. Guessing maybe flashed old 4.3 modem or kernel over the 4.4.2 stuff. Anyway, I'm downloading 4.4.2 RWC firmware for my i337m (canadian), but has anyone had this happen to them before? I've read similar scenarios, however no actual fixes. Anyone out there recover from this?

azuziel said:
I was attempting to revert to stock from pac rom 4.4.2, and made the mistake of attempting to flash 4.3 stock fw via odin. Obviously it failed. Flashed my custom recovery back thru odin and recovered a nandroid. Everything is working, wifi, data, lte...but no sound. Zip. Not even in calls. Guessing maybe flashed old 4.3 modem or kernel over the 4.4.2 stuff. Anyway, I'm downloading 4.4.2 RWC firmware for my i337m (canadian), but has anyone had this happen to them before? I've read similar scenarios, however no actual fixes. Anyone out there recover from this?
Click to expand...
Click to collapse
Since this is Canadian version try this: http://forum.xda-developers.com/showthread.php?t=1984717 This should work.

norbarb said:
Since this is Canadian version try this: http://forum.xda-developers.com/showthread.php?t=1984717 This should work.
Click to expand...
Click to collapse
Thanks. I downloaded the stock firmware from samsumg-updates.com , a little painful as the mirrors are slow. I was correct, it was failing on flashing the last step, modem.bin file before when running kitkat pac 4.2.2 with clockworkmod recovery and attempting to revert to stock 4.3. So used stock 4.4.2 firmware to flash with odin, and now getting a successful flash. Thanks for the help.
And I have sound!
Az

Reset phone and my bootloader changed to MK2 from MF9?

Philz Recovery MF9 bootloader and was on a stock rooted MK2 ROM. Going to be selling the phone so I wanted to reset it and bam it went into some upgrade looking android screen and then rebooted in my ROM but now on MK2 bootloader.
Is that right? Did my phone try to do the OTA update and fail but my bootloader updated?
Thanks

Sounds possible.
But if you're now on MK2 and you want to sell it, you can just use the MK2 .tar and Odin it to completely wipe everything.

[Q] I odin the NAE modem and it says pass but it doesn't work

I was on Gummy rom trying to flash Sac rom 4.4.2, And it said to install the NAE modem. I was unaware there was even an NAE modem. So I flashed it via odin and in about phone section in settings it said it was still MJA, i did this 5 times and the same result. I tried to go ahead and flash SACs rom but it was stuck on rotating red android boot logo. I instead flashed negalite but i want to go to sacs because negalite is kinda slow, and I think the blue theme is awful, and i flashed the stock theme and it looks just as bad.

Restore stock NAE rom could restore NAE modem & NAE Bootload etc??

Don't know Rwiloc12's stock rom here contain stock NAE modem and NAE bootloader etc in?? http://rwilco12.com/downloads.php?d...axy S4 (SPH-L720)/Stock ROMs/NAE/Original TAR
A s4 device downgrade to MDC modem for SIM unlock. After flash back to NAE modem the WIFI still can not turn on. Device originally with NAE rom, NAE Modem and Bootloader, so it could corrupt the NAE bootloader or baseband with MDC modem installed. For some people flash back to NAE and WIFI work fine, and another still can not turn WIFI on. (My previous device work.)
Now, the only method I know to restock everything back to stock.. Don't know the above link from Rwilco12 could help.. Please advice.. thanks in Adv.

Here is what you need
http://www.sammobile.com/firmwares/3/?download=25944