System-Locked Pre-installation (SLP) is the mechanism used by big royalty OEM computer manufacturers to factory activate pre-installed Windows operating system on branded desktop PC, laptop, notebook, netbook and nettop computer so that activation process of Windows is done transparently and automatically once end-user first starts the computer.The offline OEM-style pre-activation that bypass Windows Product Activatin (WPA) is implemented to reduce the chance of annoying mass PC buyers from having to deal with activation after buying the computer.
There are now three different version of SLP, namely SLP 1.0 for Windows XP and Windows Server 2008, SLP 2.0 for Windows Vista and Windows Server 2008, and SLP 2.1, which supports Windows 7, Windows Server 2008 R2, and has backward-compatibility support for Windows Vista and Windows Server 2008 too.
For OEM activation to work and able to authenticate OEM licensing for Windows, three (3) components or criteria must exist and fulfill:
- Full SLIC table in BIOS ( plant the bits into BIOS)
- OEM certificate (xrm-ms) which corresponds with OEMID and OEMTableID (Windows Marker) in SLIC table. (can put into C:\Windows\System32\OEM folder)
- OEM-SLP product key ( use to activate the system)
To use OA 2.1,
you first need to get your BIOS updated.
Now moving on to next step get OEM certificate.
Select the one based on your OEM and move it to for example: C:\Windows\System32\OEM folder
Next run the following commands after opening cmd as administrator
slmgr.vbs -rilc C:\DELL.xrm-ms
in case your OEM keys is xxxxxxx , run the command
slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxx-xxxxx
now check your activation status by entering
slmgr.vbs –dli
Now you should be all set.
