I have the Developer Version of the HTC One and I use the Viper ROM on it, I actually have been since I purchased my device.
I never paid attention to this but recently noticed that if I use the GSM / WCDMA / LTE auto, I get crappy reception - see image below.
But if I change my network mode to GSM / WCDMA auto, then I get nice reception but only HSPA speeds - again, see image below.
Both screenshots were taken in the same spot in my neighborhood. Does anyone have this issue? Should I flash a certain radio maybe?
Any help would be appreciated.