The backup camera issue appears to be a common one. See this thread.
2021 1500 Bighorn 5.7L w/ eTorque - purchased new on 10/24/20. About a month later the backup camera failed (blank screen). Shifted into park and back into reverse still nothing. The following day it was working normally. Above freezing temps during this period. Normal operation from that...
5thgenrams.com
As far as the update goes, how long has it been since it was done? Seems like a lot of updates take hours-to-days (and/or several engine cycles) before everything works properly again.