NanoPC-T6 is a ultimate device than R4S R5S R6S

[mihaibuba]

I am posting here further details on the recovery process
I used an USB-A (computer) to USB-C (NanoPC-T6) cable to connect.
From Linux

• you can use the Rockchip utility:
  https://opensource.rock-chips.com/wiki_Rkdeveloptool
  This gives you detailed control over the writing process

OR:

• The upgrade tool from the FriendlyELEC drive, which slightly is easier to use
  https://wiki.friendlyelec.com/wiki/index.php/NanoPC-T6#Option_3:_Install_OS_via_USB

OR

• From Windows you can use the RKDevTool found under Tools in their network drive which is the easiest yet to use
  • If you want to switch to English (the UI defaults to Chinese) open the config.ini file and change Selected=2
  • The blue rectangle is open file dialog. It took me a while to figure this one out.
    
    

Note: As per instructions on the rkdevelopment tools it's mandatory for all three tools to start the process by first writing MiniLoaderAll.bin to be able to access the memory.

rkdeveloptool db MiniLoaderAll.bin

And below is what needs to be written. But I haven't gotten much further than this on this tab.