I've been using a Nexus 4 for almost 2 years now. I rooted it to get LTE connection. Downgraded radio and all... it was beyond my level of expertise but I managed to get LTE and CM10, along with a custom kernel (Franco), thanks to http://hippowise.com/tag/nexus-4/
Ever since, I've been using this same set up. I once tried to upgrade to CM11 but the kernel was not compatible and ended up making my phone screen look like a STROBE LIGHT. I was freaked out and never again attempted to do any upgrades.
The phone is still working great and I have no plans to get a new phone anytime soon. But I want to upgrade my ROM to CM11 or nightly version of CM12. I want the new features that come with Android L. The thing is, I can't seem to find a way to get rid of my troublesome kernel without fully wiping the phone, causing me to lose LTE radio.
Why try to fix something that ain't broken? Maybe I'm crazy. Grass is always greener right? Any advice? Any advice against?