The MK802 $74 mini PC ships with Google Android 4.0. It also ships with root access enabled, which means it's possible to delete important system files or make other changes that could leave you with a less-than-useful operating system. The good news is that it's possible to boot an alternate operating system such as Ubuntu Linux from a microSD card...
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How to re-install MK802 firmware is a post from: Liliputing