Armbian for Rock64

[TRS-80]

Where I can find the image ?

OK, in general:

https://www.armbian.com/download/

But you will notice it's not listed.  You can still manually go to https://www.armbian.com/rock64/ however, but here we must note a few very important things:

• It's CSC (no support).  This is a red flag.
  
• There is a link to a forum thread about stability.
  
• There is another note about eMMC troubles.
  

At this point I am wondering which image Rocklobster is using?  Did you build?  Because I see a lot of red flags here.

Are you sure Rocklobster you are referring to Rock64 (and not ROCKPro64)?  I just want to be sure.

Is it possible to install it without losing anything already installed?

Generally speaking, this is not supported.  However there are some people on the forums telling how to do this.  You would be on your own however.

But there seem to be much bigger problems here, proceed with caution!

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I knew this sounded vaguely familiar.  I see gedas07 that you found your way to make this post.  I would advise to keep looking around the forums there and see if anyone found a solution.  Otherwise we are into development and bug fixing here.