From what I see in this forum the solution is very simple.
Install the usb image on your apple tv
download the hdd image and then transfer it by sftp to Apple TV with filezilla or similar
then ssh to AppleTV and do sudo dd if=OSMC_TGT_appletv_20151123-HDD.img of=/dev/sda bs=4M
reboot taking out the usb stick
then ssh again and install the wifi firmware as above.
And you will have an working HDD OSMC AppleTV
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