Hi. I don't have the references to hand but its a simple as finding right Rome twrp IMG and flashing it to correct partition. Then getting right key combination to get into it after reboot. I found instructions on you tube. Simples
If your phone is rooted, install FasterGPS and create a gps.conf file with it, that fits your location. I don't have a UMI Rome in hand but I can see that, there's no gps.conf file in the system/etc folder of any ROMs.
hello bencebacsi and Mennel .
sorry to post enter your comments.
in my case i have reflash with all old roms (and each time factory reset) but still no gps fix.
if agps off and test outdoor during 2 hours no gps in view !
with my old landvo l200g without sim card fix ok in 15 seconds.
trying also his gps.conf file but nothing like if gps modul is out....
cordialy.