Accessing a generic brand tablet's root

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I have a Thalia TouchMe (not surprised if you've never heard of it) which runs its own OS. I'd love to be able to flash it with Android, but at the very least be able to play around with it's system files, ie change the front-end layout, icons and such. When you plug it into a PC, you get a superficial root folder where you can put your personal files, but I'd like to go deeper. There's also a microSD slot.

Any help with this/ pointing me in the right direction would be greatly appreciated
Cheers

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