DVE

It came into existence sometime close(before or after I don't remember exactly) to 23.02 release. Do a full upgrade first and then check if any armbian-bsp-cli-nanopineo-* package is installed. If its not installed, then install it manually

uInitrd file is built automatically on the board when a installing a new kernel. Installing a new kernel triggers generation of initramfs using update-initramfs command. After initramfs is created, the update-initramfs triggers /etc/initramfs/post-update.d/99-uboot script to generate uInitrd file.
 
I believe you only choose to change kernel and haven't updated anything. Latest available edge kernel would have been something like 6.4.12 or something.
 
What was the output of "apt update" and "apt upgrade" Hard to understand what was going on without seeing the output
 
Upgrades are generally not tested because of resource crunch. But theoretically that is what is supposed to be done for performing an upgrade.
 
I guess this is because of your armbian config has gone missing. Again you haven't shared any of the outputs from the operations you have performed. So can't really say why that file went missing in the first place

In a couple of hours or may be by tomorrow 6.5.3 kernel will also get available
 
 
The file should be provided by armbian-bsp-cli-nanopineo-edge package. Check if its installed, Install it if its missing.
 
 Do you mean the lqqqqq thing from the screenshot? it can renders differently based on ssh client, whether you are doing running it over serial cable or whether you are doing it in graphical terminal. If you are using  ssh, try using a different client like if previously you were using putty, then try mobaxterm. If you experienced it on serial, try using ssh