If anyone is getting this error, be sure that the cert is in the directory that you're in and that you're typing the name of the cert correctly. In this case, the file is not dell.xrm-xs, it's dell.xrm-ms. You need to type: slmgr.vbs -ilc dell.xrm-ms
hi , i got the message when trying to install the key : "On a computer running microsoft windows non-core edition, run 'slui.exe 0x2a 0xC004F015' to display the error text. Error: 0xC004F015. I have done everystep carefully , and the certificate of Dell is installed succesfully. Is there anybody can help ?