Hi! I have a Blackview BV9500 and I've been trying to change the rom because it has android 8.1 and I can't setting the APN, so my phone doesn't connect to mobile data. I've tried everithing, but I think I'm doing something wrong, because nothing works. I put the "system-arm64-ab-gapps-su" in my sd card, then I enter to TWRP, wipe factory reset, wipe data, cache, etc., and then install image. I choose the image and the system ask me for the partition (i have a list), so I choose System Image partition. The image was installed, but when I reboot, the system enters in TWRP over and over. I tried also with fastboot, and the same... Please help! I don't know to do now, I don't want to come back to the stock rom, because it doesn't work to me (for the apn settings). THANKS A LOT!