My 23.9.2018 image was working fine. unfortunately it does not update correctly.
I tried to install the october image (NextCloudPi_Rock64_10-02-18.img) which at least is accessible after flashing in windows so that I can add a ssh directory. but the ROCK64 does not even boot. no ping back.
With the newest image (NextCloudPi_Rock64_11-04-18.img) the partition is not even accessible under windows. No booting either in ROCK64.
I Think avh02 already posted something similar on Nov. 2nd. No answer to that question until now.
Is there anyone out there who has successfully installed one of those images?