How reset to factory default a Dell switch PowerConnect 5212?

My brother in law has purchased a used Dell PowerConnect 5212 switch, but it came with no HW manual and one could not be found on the 'net. It has a set of jumpers, but alas, we can't figure out which would be which. Does anyone know where to get such a configuration documentation, or at least, how to reset... show more My brother in law has purchased a used Dell PowerConnect 5212 switch, but it came with no HW manual and one could not be found on the 'net. It has a set of jumpers, but alas, we can't figure out which would be which.

Does anyone know where to get such a configuration documentation, or at least, how to reset this unit to factory configuration? He says that from there, he can configure it.

Thank you!
Update: We had obtained the User Manual from the Dell website, but it contains no information on hardware configuration. There is a way to reset it from within the OpenManage interface, but we can't get to that point.

Thanks again for your help.
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