We can use SMB 
Dune Box R 4K Plus also has one USB3 and one USB2 port, but I use CoreELEC just fine from USB2.
Maybe you can try using a different usb drive for CoreELEC.
@Portisch
With the latest nightly, the Dolby Vision not working on my TV. What could have happened? I also tried a hard reset.
CoreELEC:/sys/class/amhdmitx/amhdmitx0 # cat dv_cap
The Rx don't support DolbyVision
Thanks, I found the bug, Dolby Vision was turned off under Android, it seems that this switch also affects CoreELEC.
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You, my friend, need a NAS. Network attached storage. Solves all problems.
It was just because my USB stick is dying. Tested with a new one and everything goes well even with the USB2 port.
Hopefully I have my Shield’s remote that works pretty well.
I have shitty 4G internet box without any Ethernet port and I don’t want to buy NAS to plug it a blinking WIFI dongle.
you can try USB Hub, i dont know if can boot via Coreelec
Powered USB hub would be better right, its what I use
I know it’s still an Alpha and my Nokia 8010 is not totally supported.
But is it normal to have 2 seconds of verbose booting, then CoreELEC animation, slowdown in animation, black screen and finally Kodi. Booting on my previous box was always flicker free.
How did you get 40% off? 
I bought it on regional wholesaler, it was probably returned by someone and as they can’t resale it as new they reduce the price. I can return it too if I want so I bought it to test CoreELEC because I can’t find any Homatics near me and I don’t want to go to some Chinese eshops because random taxes and so on.
Please follow this, as usual:
https://wiki.coreelec.org/coreelec:ce_support
At least post dmesg but if it boots to CE and everything is working, it’s done. The boot process is a bit slower than running directly from emmc but the certified status of this devices gives us less freedom than with other devices.
Here is what I have at startup visually for about 1 second:
And here the dmesg output:
https://pastebin.com/raw/XzksAr4u
EDIT: No verbose when using 4K television, slowdown in starting animation is still there.
It’s like this, everyone experiences it, it happens on other devices. Ignore it.
So everything went well! I’ll be able to test all kinds of stuff and compare with my Zidoo to see if there is any difference in rendering.
If you have any test videos I’m interested. I start with some links:
More important, what did he/she pay? 
Got one on the way, will try this.
I paid 69€, I thought it was a Nokia 8000 at first and then no it was a 8010. The price on Amazon has increased since then, I guess the demand is increasing and CoreELEC support is probably the reason.
Ah, I know in the beginning pricing was wrong on Amazon (.DE), it was priced at €79,- or something like that. But it wasn’t available at that moment, could be ordered as backorder. I know a person that ordered two of them and got them for that price, months later. Price went up to €129,- (the “normal” price), and even much higher because of no available stock. Clear, at €69,- it’s a real great buy 
I saw in this thread that it would be possible to be in Dolby Vision even without launching a video, basically being in Dolby Vision all the time. Is this supported? It’s still nice when the HDMI sync time is big. My cousin leaves everything at 60Hz only for this reason, his TV takes 15s to switch from one mode to another.