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[Guide] Lenovo ThinkStation P520 / Lenovo ThinkStation P520c- SUCCESS

My System specifications are :

Lenovo ThinkStation P520 (But it should work on the Lenovo ThinkStation P520c too) Intel Xeon W-2135 3.7GHz 6 Cores 12 Threads (Will Be Upgrading to the Xeon W-2255 10 Core 20 Threads If the motherboard will support it later) Nvidia Quadro K600 1GB (May throw in a RX 580 or RX 5700XT Later) 1 x 8 GB 2666MHz ECC RDIMM DDR4 RAM ( Will be upgrading to 32 GB but Max Supported Size 512 GB ) 1 x TEAMGROUP MP33 512GB NVMe SSD (Windows 11) 1 x SANDISK X600 SSD M.2 2280 256GB SATA 6.0Gbps (macOS Sequoia) 1 x Seagate IronWolf 8TB NAS Hard Drive (For Data)

What Works:

*Rear Audio using AppleALC ( With the Attached EFI folder)

*All USB 3.0 & 2.0 ( With the Attached EFI folder)

*Ethernet (With the Attached EFI folder)

*I'm using OCLP on my Quadro K600 and it works for graphics acceleration but can barely drive my 4K TV, I would advise anyone who would want to try this to get an RX 580 or the RX 5700XT as those work natively with macOS.

  • Sleep/Awake (Even after letting it sleep throughout the night it wakes right up to the lock screen after I press the keyboard, mouse, or power button in the morning.)

What's Not Working

*Front Audio

  • SD Card Slot ( I haven't tried it so I can't tell if it works or not.)

BEFORE YOU TRY TO INSTALL MACOS ON YOUR LENOVO P520 YOU WILL NEED TO DOWNGRADE YOUR BIOS TO S03KT48A AS ANY OTHER BIOS UPDATE AFTER THAT WILL NOT WORK AND IF YOU TRY TO UPDATE THE BIOS AFTER THE INSTALLATION, MACOS WILL NOT BOOT(I TRIED THAT).

  1. DOWNLOAD THE BIOS VERSION S03KT48A ATTACHED TO THIS POST
  2. ALLOW BIOS DOWNGRADE IN YOUR BIOS SETTINGS
  3. CREATE AN EFI PARTITION ON A USB THUMB DRIVE
  4. EXTRACT THE CONTENT TO THE ROOT OF YOUR EFI PARTITION
  5. RESTART AND BOOT FROM THE EFI PARTITION OF THE THUMB DRIVE
  6. PRESS "N" WHEN ASKED TO CHANGE SERIAL AND BOARD NUMBERS
  7. ALLOW THE REST OF THE PROCESSES TO FINISH
  8. TYPE EXIT AND ALLOW THE PC BOOT INTO WINDOWS.
  9. RESTART THE PC AFTER GETTING INTO WINDOWS AND ALLOW THE BIOS DOWNGRADE PROCESS TO FINISH AND BOOT BACK TO WINDOWS
  10. CHECK YOUR BIOS VERSION WITH DXDIAG TO BE SURE YOU ARE ON BIOS VERSION S03KT48A.

CREATING macOS Sequoia USB Installer

  1. The method I used to prepare the Sequoia USB Installer can be found here

  2. Download and Extract the EFI attached to this post.

  3. Copy and Paste the Extracted EFI folder into the EFI partition of your USB installer.

  4. The installation process is simple, I followed the guide from the tonymacx86.com site and used APFS.

  5. I also used -v so you can detect when you encounter issues during installation.

  6. After the installation is done, download the latest Open Core Configurator or Open Core Auxiliary Tool and mount your macOS Drive EFI partition and USB Installer EFI Partition.

  7. Copy the EFI Folder From your USB installer and paste it in the macOS drive EFI Partition.

  8. If you are using any Nvidia Kepler Cards like my Quadro K600, you will have to Download Open Core Legacy Patcher to get Graphics Acceleration working. If you are using the AMD Polaris and Navi supported cards you don't need that as they are natively supported and should work OOB. You only need to input agdpmod=pikera for Navi cards.

  9. Restart

Conclusion: macOS Sequoia 15.0 should now be working on your Lenovo P520 / P520c CustoMac.

Link to All files needed for this hack can be found here:

https://www.tonymacx86.com/threads/guide-lenovo-thinkstation-p520-lenovo-thinkstation-p520c-success.330708/

NB: The Attached EFI works with Big Sur, Monterey, Ventura, Sonoma and Sequoia

An in-depth video is coming soon. Kindly Subscribe to my YouTube Channel to be notified when it's available.

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