yes and have
lol, you actually did not need to unlock your device:
I updated to 9.0.13 with this method
Why not flash a full ROM straight from OnePlus???
And unless they are installing TWRP, they aren't installing a ʾcommunityʾ ROM. ROM images must be signed.
Once unlocked I'd flash TWRP and then a full Oneplus ROM
i flashed the ROM downloaded the 9.0.13 from one plus then upgraded it to that, worked like a charm it orignal one plus ROM downloaded from the one plus site. I did have my phone sim unlocked from Tmobile and Bootloader unlocked from OnePlus .
i can verify that you will receive OTA updates as i just updated to 9.0.14 OTA
OxygenOS 9.5.7 for OnePlus 7 Pro
by Manu J., 2019-06-07