I'm using 22.11.4 Bullseye on Helios4. 23.02.2 is available in dl.armbian.com (and mirrored) since Feb 18th. But an upgrade of my installation is not possible because apt.armbian.com/dists is from Feb 12th (all mirrors) for all supported platforms (not only Helios4). It could be that the problem is related to last year's problem discussed in https://forum.armbian.com/topic/19982-how-to-upgrade-to-2202/ (aptly?).

I'm not completely sure, but I think this is intentional, as 23.02 hasn't been officially released yet.  It is to be released this weekend.  The builds get pushed out to the mirrors which takes some time for all the mirrors to sync up as the first step.

@SteeMan

Thank you for your explanation. I'll keep patient.