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:

  1. Full SLIC table in BIOS
  2. OEM certificate (xrm-ms) which corresponds with OEMID and OEMTableID (Windows Marker) in SLIC table.
  3. OEM-SLP product key

SLP OEM Activation 2.1 works in very much the similar way of OEM Activation (OA) 2.0, with no change to activation technology, and OEM does not require to change factory process to accommodate new SLP 2.1 OEM activation. The only changes is Windows Marker version is now version 2.1 instead of 2.0. Even the digital certificate, which has file extension of .xrm-ms, signed by Microsoft with OEM’s SLIC public key (0x9C bytes) with Microsoft’s private key together with OEMID of SLIC table, is unchanged.

OEM Activation 2.1 for Windows 7 and Windows Server 2008 R2

The second part of SLIC table, Windows Marker (0xB6 bytes) is created and signed by OEM with OEMTableID and OEMID together with OEM private key that matches OEM’s SLIC public key. OATools released by Microsoft will now write a new version 2.1 of OEMTables, hence a new Windows Market in different binary format for Windows 7 and Windows Server 2008 R2 OEM activation. Windows Vista and Windows Server 2008 accept both Windows Marker formats (OA version 2.0 and OA version 2.1), but not vice versa.

Thus, aside from new OEM-SLP product key (leaked Windows 7 Ultimate OEM-SLP product key) which is required for each edition of Windows 7 and Windows Server 2008 R2 in order to complete the OEM activation process, whether or not the SLIC 2.1 exists in the BIOS will determine whether the installed Windows 7 or Windows Server 2008 R2 can achieve instant offline activation on system boot up.

How to Determine, Check and Verify Whether SLIC in BIOS is OA 2.1 Capable for OEM Activation

Download and install RW-Everything Read & Write Utility. Run RW-Everything, then click on Access pull down menu, follow by ACPI Tables. In the opened ACPI Table window, click on SLIC tab. The display will look something like the illustration below, or see SLIC 2.0 and 2.1 example here.

SLIC 2.0 Table in BIOS
A ACPI Tables Dump with SLIC 2.0

SLIC for OA 2.1
A BIOS SLIC Table Dump of OA 2.1

If the 4 bytes in highlighted area are 00 00 00 00, the SLIC is version 2.0
If the 4 bytes in highlighted area are 01 00 02 00, the SLIC is version 2.1.

If you’re having SLIC 2.0 in BIOS, try to wait for computer manufacturer if it will release new BIOS update that includes SLIC 2.1 table. Else, it’s possible to modify the BIOS (hardmod or biosmod) to include the SLIC 2.1 (assistance available at Windows 7 forum), or uses a OEM-BIOS emulator which commonly known as Windows 7 Loader, which in turn made use by various activators and toolkit to emulate a SLIC 2.1 on boot up.

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  • Jackie

    I cann’t find the SLIC tab in opened ACPI Table.who can help me?

  • Fafhrd

    Newer versions of can be found and downloaded at the author' site:

    I guess we have Jacky to thank. If you get to the page in Chinese, it's the big green button with the down arrow on it. It's free, and quick, unlike the link in the article.

  • Dragonfly

    thank you everyone

  • D'gus

    thank's for information….

  • D'gus

    thank's for information…..

  • Astokki

    Hi everyone,

    If you want to covert any windows operating system into genuine OS….

    Contact me at

    satisfaction Guaranteed!!!!

  • Pingback: Windows 7 Ultimate Cracked and Activated Permanently with OEM SLP Master Product Key (with SLIC 2.1) » My Digital Life()

  • Kunwar

    Hi all

    I have a copy of Windows 7 Ultimate AIO Activated. But it is not a genuine copy. Can anyone tell how to make it genuine. Is it just by providing the "Key".



  • hutjeflut

    not all mobos ahve a SLIC version as described here my mobo for example is a oem moard from msi wich needs a costumized bios for it to work so if you cant find it you most likely have a oem tab instead.

  • Julio

    I have failed to activate my windows 7 ultimate

  • ambrish singh



    plz tell me how active windows 7 ultimate 32 bit active plz sir

  • Oğuzhan

    i cant find american megatrends bios slic :(:(:( can someone help me??? i cannot make windows 7 original…



  • Cool8818

    You can Check your SLIC version with

    Everest Corporate 5.30

    i have Acer Aspire 6935G

    with Bios 1.13….

  • You can Check your SLIC version with

    Everest Corporate 5.30

    i have Acer Aspire 6935G

    with Bios 1.13

  • kishore

    hw to find motherboard serial number using run command…. is ther any way to find if, so pls send me the command along with screen shot

  • mike


    You can insert SLIC tables easy check the forum

  • Florin

    a also don't have a tab SLIC, this is my table:

    52 53 44 54 38 00 00 00 01 EE 48 50 51 4F 45 4D RSDT8…..HPQOEM

    53 4C 49 43 2D 4D 50 43 03 00 00 00 20 20 20 20 SLIC-MPC….

    13 00 00 01 00 D0 EF 6F 00 C0 EF 6F 00 B0 EF 6F …….o…o…o

    00 00 EE 6F 00 F0 ED 6F …o…o

    Signature "RSDT"

    Length 0x00000038 (56)

    Revision 0x01 (1)

    Checksum 0xEE (238)


    OEM Table ID "SLIC-MPC"

    OEM Revision 0x00000003 (3)

    Creator ID " "

    Creator Revision 0x01000013 (16777235)

    Entry0 0x6FEFD000

    Entry1 0x6FEFC000

    Entry2 0x6FEFB000

    Entry3 0x6FEE0000

    Entry4 0x6FEDF000

    can u tell me what SLIC i hav pls.. tnx

  • mehness

    Hi, i ran the utility linked in the article to check my slic bios version, but when it finishes dumping all the info, there is no slic tab in the window to check the numbers. How do I do this. Please help.

  • i don't worry. i run linux.

  • I'm using Windows Vista on my HP Pavilion with W00tageman's crack. I ran the RW-Everything app and opened the ACPI Table page. From what's instructed above, mine seems like a SLIC 2.0, BUT THEN on the right column – i find the names Asus and Notebook.

    So i guess, this tool is just reading off the simulated ACPI table – from W00tageman's Crack – and NOT my HP SLIC table.


  • kd

    use award tool.

  • Pingback: RW-Everything Utility Free Download to Access and Dump Computer Hardware Info » My Digital Life()

  • realdreams

    namely SLP 1.0 for Windows XP and Windows Server 2008?

    It it a mistake?I think it's Windows Server 2003

  • BBB

    With Everest v5.02.1819 beta you can check the version easily under Motherboard/ACPI/SLIC

  • manji

    Hi Guys,

    I used Vista activation with no pb, I have SLP OA 2.0.

    But I tested several recent Win7 Loader without success, for information I upgraded my French Vista with a French Win7.

    Any ideas?

  • Pingback: Windows 7 Usage Guides, How-To Hacks, Tips and Tricks (Complete List) » Tip and Trick()

  • Pingback: |--Windows 7 Loader OEM 1.4 (Fixed) by Orbit30/ Hazar (32 and 64 bit)--|()

  • HappyUser007

    To find datas : you can use Hedit 3.

    Just open the bios in it, Ctrl + F, type "SLI" or "WINDOWS" then you should find info according to the pics above.

  • HappyUser007

    By ages I meant monthsd, The farest is 5 months for a 6730b model

    2730p for 4 months.

    7800 since 4 months

    7900s since 5 months

  • HappyUser007

    Thats pretty strange, I checked HP notebook and tablet PC I own, and they all include SLP 2.1, since ages. Are you sure of that ?

  • 600wpmpo

    My SLIC table looks like this:

    [IMG ][/IMG]

    The tab i clicked was SLIX and not SLIC

    What do i do ?

  • Michael

    Can't you check this with Everest Ultimate?

    • admin

      Everest, no!

  • perot

    Nevermind just saw bush's comment…bootloader then.

  • perot

    i have the same problem like adi…In the opened ACPI Table i don't see any SLIC tab

    whats wrong?

  • Joel

    SLIC doesn't show for me either :(

    I have Asus P5K-V Motherboard

    So what do i do?

  • mac

    ran the rw everything utility to get the table dump read out, but when i find the line of 4 highlighted bytes i get a reading of 00 06 02 00?? any clue to what this means? im running a gateway M-7323U laptop, im somewhat of a noob sorry to say but i ran the msinfo32 and found that my BIOS is a phoenix so any help would be really appreciated

  • bush

    then you have to edit your bios to inlcude a slic talke. but it´s not easy.

    better wait for a bootloader.

  • adi

    i don't have a tab SLIC. my motherboard: Gigabyte P35 DS3R 2.1