I bought an "unlocked" LG g7 with model number G710ULM running on Android 8.0. I tired to update it to Android 9 to no avail. I tried OTA, and even LG Bridge, later I found out it was a Sprint version cross flashed with an unlocked US version.
Please i want to know if i can update it to Android 9 by flashing the KDZ file with G710ULM Using LG UP? And I hope there won't be a problem doing that.
Also if I can do that do I need to unlock bootloader?
I really need an answer please.