Can't install H3G firmware, keeps soft bricking my phone (SM-G920F)

I have tried to install UK's Three firmware but it keeps failing after hidden.img, I can get my phone back by installing the BTU version (G920FXXU2COH2/G920FBTU2COH3/G920FXXU2COH2/G920FXXU2COH2). Why can't I install the H3G version (G920FXXU2BOG8/G920FH3G2BOG1/G920FXXU2BOGE/G920FXXU2BOG8) ? Will it make a difference if I install the H3G one with reception? WIll my reception inprove? The reason I want to do this is that my S4 has better reception than my S6, so I assume that maybe if I get the H3G version installed the reception will be better. I can't believe that my S4 has better reception.