This is just R58_G_10.05.00I_martiniquerefresh packaged into R57_G_10.08.07R_GSMA910BTUK042. Few changes (home screen hasnīt default look, BTUK iconset (as menu animations in R58 firmwares look somewhat broken).

Flash on your own risk. Should work with A910 (R57*), wonīt work on A910i (R58*). Enjoy!