Web page + connect to router + configuration utility + reset + firmware = didn't change mac. New mac is not tplink's - 00-23-79-FF-FF-FF Union Business Machines Co. Ltd. I can't use more 1 'bad' 108e...

Hi. I have some TL-SG108E. Some days ago some switches changed mac from CC:XX:XX:XX:XX to 00:23:79:00:23:79. All switches has one mac. How change new mac to old factory mac?