This seems to be an appropriate place to mention my experience as well. Last night I put cm 11 on my phone after reports of people getting MMS to both send and receive over LTE. I spent hours playing with both the fixes, changed APNs manually to things I had found on forums (mostly older settings) and nothing seemed to work. What eventually made sense to me is that if it really did work for some people out of the box and their phone hadn't reverted to 3g, it likely had something to do with the modem since that's not touched by flashing a custom rom. I had flashed the MK5 modem alongside CM11 and was only able to send MMS as a result with the 2nd fix.
After all that I finally discovered that the MG2 modem with the 2nd update (labelled as LTE send only) allowed me to both send and receive over LTE. I would love to get feedback and see if it works for others, which could hopefully lead us to narrowing down a permanent solution that could work on all modems.
After all that I finally discovered that the MG2 modem with the 2nd update (labelled as LTE send only) allowed me to both send and receive over LTE. I would love to get feedback and see if it works for others, which could hopefully lead us to narrowing down a permanent solution that could work on all modems.