[Galaxy Note 3 Q&A, Help & Troubleshooting] neoKushan:
Okay, so I've had this issue for a few months now where no matter what I tried, I could not update my Baseband. I tried everything I could think of - flashed the full stock Rom, used mobile ODIN, flashed twice, etc. but no matter what, the baseband would stick to the old one. I tried googling and looking around but the same tricks as above were posted again and again to no avail.

I eventually found the answer, it was a single post buried in a thread on here. As I keep seeing posts from other users with the same issue, I figured I'd write a quick guide so that hopefully those searching for the problem will find it.

So to reiterate - you've just updated to a new firmware (custom or otherwise) but your radio (aka baseband) has not changed. You then try to flash the radio directly but it still won't change. What gives?

Well to fix it, you're going to need the following:

Odin 3.07

Triangle Away (Thanks to Chainfire, as always)

A Method of rooting your device (I'm leaving this up to you as it's a warranty voiding experience and I presume you know how to do that by this point).

An official Samsung firmware containing the radio you want to update to

If you're currently on an AOSP based ROM, then I have bad news - you'll need to flash back to touchwiz to do this. Once you're done, you can flash back though.

Remember to make a backup of all your data, as you will be doing a lot of flashing here.

Note: You may be able to fix your stuck radio problem without flashing back to a completely stock firmware and cutting corners elsewhere, however I wanted this guide to be bulletproof, deviating slightly may produce different results. If all else fails, follow each step below exactly!

Remember: This guide is specifically for those of you who have tried other methods and are still stuck on an old baseband. If you're just looking how to flash your radio, there are easier and less involved methods that don't require any wiping - I strongly advise you to try those first.

Okay, by this point I'm going to assume you've done all your backups and are ready to start flashing.

Step 1: Reboot your phone into DOWNLOAD mode (aka Odin). To do this, hold down POWER, VOL-

DOWN

and HOME at the same time until you see the following screens:

[IMG="Credit goes to galaxynote3update.com for the image"]http://i.imgur.com/KSqVmve.png[/IMG]

Remember to let go of the above buttons and press "volume up" to continue.

Step 2: Open up Odin 3.07, click on the "PDA" button and select the stock firmware file you have downloaded (file should have a ".tar.md5" extension, if you downloaded a .zip file you'll need to extract it but DO NOT EXTRACT MORE THAN THIS, you want a single .tar.md5 file).

Step 3: With your phone connected to your PC running ODIN, click "start". This will take a few mins, so be patient.

Step 4: Root. Now your phone should be rebooting into some pretty awful stock Samsung firmware. Boo. However this is a necessary evil. Here you need to root your phone. CF-Auto-Root is my preferred method but this trips Knox so do what you feel is best.

Step 5: Install and run Triangle Away. Triangle Away requires a Stock samsung kernel, which is why you've just flashed a full Samsung firmware. Triangle away requires root, which is why you've just performed Step 4.

Step 6: Install the Stock Firmware. Again.

That's right, repeat steps 2 and 3 once more to flash that stock Samsung firmware all over again. Except this time, your system is reporting that it's "official" and TriangleAway has cleared some flags that were preventing the updated radio from installing. When your phone reboots, your radio should have updated.

You're done! From here, you can do whatever you like - flash another custom ROM (you're still rooted at this point), wipe and restore a backup you made earlier, switch to AOSP or whatever. Personally, I would go buy Chainfire a beer as TriangleAway is what makes this all possible.