On a DIR-878, the upgrade to 22.03.0-rc1 sysupgrade, preserving configuration, was smooth.
HOWEVER, had issues that I thought I should report:
- wired and Wi-Fi clients (both 2.4 GHz and 5 GHz) could see and connect to the router, but not communicate with the Internet
- Connecting to the router via SSH worked, and tests (ping, traceroute) revealed that the router could see both LAN clients and WAN.
- Suspect Firewall issue (?) but could not see anything out of the ordinary.
- Reboots of both the WAN modem and the router itself did nothing to resolve the issue.
Unfortunately, I did not have the time to properly debug, as I am on an active system, and just wanted to test. Installing/downgrading to 21.02.3 was successful, and worked with minimal configuration adjustments.
I will need to wait until a fix is released, or documentation is updated for common upgrade steps required to get back to operational...