Check the current device

Get into POS

Select Three Dots on top right
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Find the device name at the bottom
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Uninstall the POS

Open TestFlight - Select correspond APP - Previous Builds

Select the version Oolio Support provided to you
Here we will choose 1.5.0 as an example
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Click on the suggested version and press install
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Login in with merchant credential
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Get into POS and pick up the previous device
For example:
Here I need to choose the previous Test Device to inherit the original settings.