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I understand…
But I see that this box doesn’t have SD slot… so, I don’t know if mine only works dualboot with SD or not…

In any case … if I could only use the SD, do you think it might be a good idea to try a different SD?

EDIT:

Ok, yes, I got confirmation from another site, that I can boot coreelect on my device with a USB stick.

Well, I’ll try it and tell you as soon as I get the results.