Can I flash a separate radio image and have a working radio? I have a rooted LGE Nexus 4. Installed on it are the Team Win Recovery Project and CyanogenMod 13 (Android 6).

I found this guide to installing stock Android 6 onto a Nexus 4, and it provides pre-built system and boot images, alongside:


  ... an OLD radio (initial radio release for Mako), [and then] this ROM will support LTE :)


In the comments section of that post, a user added how to install the pre-built image:


  
  From command terminal:

fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash radio lte_modem.img (or normal_modem.img)
fastboot reboot-bootloader

  


My question boils down to, can I just flash the lte_modem.img alone and come out with a working phone with CM13? 

If that isn't inherently answerable, then: if something goes wrong, can I flash normal_modem.img, or do I need a CM13-specific radio image? Where do I get that special radio.img?
(Previous) Nexus 4 owner reporting in.

People at XDA had long been using hybrid modems with custom ROMs like CM. It seems specific versions are needed for each major Android version (JB/KK/LP+), but there's a nifty app right here you can try out: LINK: Google Play.

Also, there's no special radio for CM13. No custom ROM team makes radio themselves. Just flash back to a stock radio if things go wrong.