You do not know this matter at all, right?
You can not increase API level or Android version. Situation is similar to mobile phones > the manufacturer must release a new version of the operating system - device firmware.
And with Chinese manufacturers, it can easily never happen...
Or if the device is popular and there are clones it is possible for someone to modify or port the rom from another device.
XDA is the most famous forum for that matter and it is possible that a solution can be found there.
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