Well, those two devices seems not to be same as others - they doesn't respond the same way to the same procedure like others. If WWW UI is not accessible after factory reset and unit have network connectivity like other units that works, then such particular unit is either broken or restricted/OEM. In both cases there is little you can do with it - unless you can return it to seller.
If you are curious, you can call Cisco SMB support with unit serial number ready - they may disclose the unit is restricted or not.
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