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[Q] USB hub + OTG + tablet problem

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Hi,
i have a Cube U23GT tablet. It supports OTG. The tablet can be charged only trough DC in with an adaptor, so not trough usb port. I have an OTG cable, and if i plug with that a mouse in, or keyboard, it works perfectly. I saw on youtube some videos where people connected mouse and keyboard at the same time to their tablets, for example: youtube.com/watch?v=benblX95ORM
So as i saw this video i thinked: all i need is an USB HUB, i bought one: logilink.eu/showproduct/UA0138.htm?seticlanguage=en
I plugged the HUB in trough OTG and the result was: the LED of the hub lights are on, but then, when i try to plug the mouse OR (not just "AND") the keyboard, it wont work. The infra of the mouse is lights too but the tablet dont detect it, i cant use it.
So can you tell me what can be the problem? Its not a powered HUB i know, but on the videos that i saw (for example what i linked here) arent powered hubs too, and works.
If you can, please help me, thanks!

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