Running a separate android operating system on android mobile or tablet devices. Something like virtualization or container. For a reference you can take a look at VMOS app:
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It is exactly what we expected to be done. Other requirements:
- Permanent changes in second OS
- Ability to install on un-rooted devices
- Support a majority of android versions (specially earlier ones)
Only the bids that shows a high probability of achieving all the goals would be consider.