Thought I'd share my findings so far.
I successfully flashed my xq bc72 to sea firmware. I believe it was previously on hk. Didn't notice any improvement ( sitting at my desk doing speed tests ) was getting roughly 15-20mbps on 4g+ in Australia Melbourne on optus.
Also flashed tw, pretty much the exact same thing. Signal strength on all firmware was very weak sometime not even there but speed test were still running at the same speeds.
Flashed to xq bc52 UK o2 just to give a try, signal strength seems stronger and speed test show roighly 25-35mbps. Will use this through out the day to test and update. Thank you for the guide
Still can't get volte to work. 5g not sure yet as I don't normally get it at my house.
I have the XQ-BC72 too, and I believe the firmware is HK (is there a way to check which firmware it is on?), since this is an imported set which came from HK. I've had the phone for almost 2 months now, but the firmware version is still on 61.0.A.11.23. Refreshing the software update doesn't really do anything, and it made me wonder if it's due to me being in Malaysia with it's own mobile settings that's causing the phone to not get the latest firmwares after 61.0.A.11.23.
I would like to ask, if it is fine to flash the SEA firmware, and if it will cause any issues to the phone or not? I read that with version 52 of Newsflasher, my user data should be intact. Logically, there shouldn't be any issue, right?
I maybe just want a proper confirmation before I make the jump, since this will be the first time I will attempt to do this, and I hope nothing goes wrong.