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I have a Wiko Jerry phone, after some bootloader install has already happened on it.

Volume down + poweron gives this:

enter image description here

It looks like some test firmware, but it has no name/version info.

What is that?

peterh
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    This is the factory test menu (test all device features before it leaves the factory) which can be triggered by a pressing certain key combination at start-up. On most phones it is shown in Chinese language like shown here: https://android.stackexchange.com/q/219469/2241 – Robert May 14 '20 at 07:25

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As comment says, it is the factory test firmware of this specific model (wiko jerry 1). There is no documentation, or practically anything for it. It is used mostly by the manufacturer, to initially test/setup the device after production; although it is also an useful test tool in the case of mysterious hardware problems.

peterh
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