I just enrolled One UI 3.0 beta with my Note10+ and started installing. I saw the phone entered the updating screen and left the phone aside. After around 40 minutes when I check the phone, I see that the phone is stuck on the "Samsung" screen. Now it has been another 30 minutes or so, it's still stuck. I tried pushing power + vol down to reboot, and power + vol up to enter the SS RDX screen. Other there nothing I can do and the phone is still stuck on the "Samsung" screen.
I have the same issue however I can't seem to factory reset my device because the menu for it won't come up and smart switch on the pc gives an error and won't connect to the device.
Volume up + power taking me to recovery screen. Did you do anything else?
This happened to mine too. I did the power and volume up and it rebooted, and ended up passing the Samsung screen. Sorry it didn't work for you.