You can flash it via adb using adb sideload on a PC but Alliance Shield won't work anymore at this time due to Samsung Revoking their Knox ability
I was about to Odin flash a U1 firmware just to flash ZVIA but I'll wait for ZVIB since a lot of people are saying it's a lot more stable
Correct. You will no longer receive ota's and have to flash every beta manually. Also, not sure if there is a ZVIB for s21ultra snapdragon
Finally! Thank you Mr Daniel! Any comments regarding known bugs?
Oh, I'm using nova launcher, so haven't noticed that one. Even though is running okay until now. Hope they release the updated version very soon. Oh, is it true that no OTA for us :/ so we need to wait the link for beta 2 and so on?