As far as I know, there isn't one yet. And I'm not upgrading the baseband until there's a proven method that won't break my StealthSIM hack. 1.1.3 is working decently reliable for me at the moment, so I'm not about to screw it up.
I was cleaning the drive yesterday, and something happened in there that caused half my icons to disappear. I had no choice but to redo 1.1.1 > 1.1.3 journey all over again. It took me about 2 hours to redo the hacks. 🙁