This is my first post so let me begin by saying thank you for bringing up Armbian!
I've just received 3 Orange Pis (one PC which is dead on arrival, one Pi One and one Pi Lite) this morning and spent the whole day finding distros to boot.
I had the exact freq fail error and I found this post by searching for this in the forum, so thanks also to aegrotatio for opening up this thread.
I tried sudo apt-get update && sudo apt-get upgrade and I have resolved the issue.
However, the freq fail is an ongoing loop and it was impossible to do it via a keyboard as the screen was filled with the [ERR] lines.
I used putty over ethernet and there things were quiet, so I entered the command there.
Even then, the first attempt failed with the system giving me an error like "can't write to directory ... because I am not logged in as root" (didn't ommit sudo!).
I attributed this to the [ERR] that must be going on in the background, so I tried it a second time and this time everything went smoothly.
May I suggest, since 5.11 is available, to update the downloads in this site to allow users get the 5.11 by first try?
It will save a lot, like really a LOT of frustrating hours because the first thing it comes to mind when confronted with something like this on a $10 chinese SBC is to fear for hardware failure!
Best wishes for the Armbian effort, it is high time we get serious with the Arm platform.