OpenCore Hackintosh EFI for Lenovo ThinkPad T490

Based on the OpenCore bootloader; off of the OpenCorePkg made by acidanthera hosted on GitHub. Followed the Dortania's OpenCore Install Guide to get everything working from scratch for the best stability and compatibility! Make sure you also follow the prequisites and UEFI settings! If you find my work useful, please consider supporting me at Ko-Fi❤️

WARNING/DISCLAIMER (VERY IMPORTANT): This EFI only supports running macOS Big Sur (11.x) to macOS Sequoia (15.x)! Also, bluetooth DOES NOT work starting from macOS Sequoia Public Beta 2/Developer Beta 4!

Prerequisites

If you don't have the T490 - Type 20N3 like me, make sure to disable "UTBMap.kext" in Config.plist and enable "UTBDefault.kext" instead. However, I highly reccomend you map the USB ports and generate a newly created "UTBMap.kext" with the help of USBToolbox instead! In order for Wi-Fi to work on macOS Sequoia (15), you MUST download & install an application named HeliPort.dmg from the HeliPort GitHub repository (I have updated the link to a more stable version, so update to that if you already haven't done so). It is also recommended that you install the latest release version of an app named YogaSMC from the YogaSMC GitHub repository. Double click the "YogaSMCPane.prefPane" file in the "YogaSMC-App-Release.dmg" file and drag the "YogaSMCNC.app" file to "Applications" folder. If you are thinking of using a macOS version before Ventura 13.3; replace the boot-arg "-igfxblt" with "-igfxblr" in NVRAM/Add/7C436110-AB2A-4BBB-A880-FE41995C9F82/boot-args. (no need for that anymore!)

My Specifications/Specs

Type	20N3
CPU	Intel® Core™ i7-8665U Processor @ 1.9GHz (Whiskey Lake)
RAM	16GB DDR4 2400MHz
iGPU	Intel® UHD Graphics 620
SSD	NVMe M.2 AGI512GIMAI298 512GB SSD
WLAN+BT	Intel® Wireless-AC 9560 (A BCM card natively supported by real Macs will work more stable)
Audio	Realtek ALC3287 (ALC257 codec)
Ports	2xUSB3.0 Type-A, 2xThunderbolt 3, HDMI, Micro SD card reader, and Headphone Jack
OpenCore Bootloader	V1.0.1 MOD (Will constantly be updated, including the kexts/drivers, so all you have to do is come back after a month or so and look for a commit along the lines of "Updated OpenCore to X.X.X MOD!" or check the latest release for something like that)

BIOS/UEFI Settings

After powering on the machine, spam F1 until you hear a beep to enter the BIOS. Change the following settings:

Category	Setting
Config	Display Shared Display Priority: HDMI Total Graphics Memory: 256 MB CPU Intel Hyperthreading Technology: ON
Security	Fingerprint Predesktop Authentication: OFF Security Chip Security ChipON or OFF (enable for Windows 11) Memory Protection Execution Prevention: ON Virtualization Kernel DMA Protection: ON (enables VT-D by design) I/O Port Access Ethernet LAN: ON Wireless LAN: ON Bluetooth: ON USB Port: ON Memory Card Slot: ON Smart Card Slot: OFF Integrated Camera: ON Integrated Audio: ON Microphone: ON Fingerprint Reader: ON (works in Windows only) or OFF Thunderbolt 3: ON Absolute Persistance Module Absolute Persistance Module Activation: Disabled Secure Boot Configuration Secure Boot: OFF Intel SGX Intel SGX Control: Disabled
Startup	UEFI/Legacy Boot: UEFI Only Boot Mode: Quick (Skips Diagnostics)

Not Working

• You tell me?!

Working

• Everything else that is not in the Not Working section :D
• Bluetooth (works natively on all macOS)
• WLAN (works natively on all macOS except Sequoia; read this section for easy instructions on how to fix for macOS Sequoia (15).
• USB ports mapped precisely (working after sleep)
• Thunderbolt (should work, as I have NOT tested it)
• Synaptics SMBus Trackpad with fully working gestures (using VoodooSMBus, VoodooPS2, and VoodooRMI)
• Audio (and the keys for it), with speaker, microphone, and headphone jack support
• Graphics Acceleration (QI/CI)
• Sleep
• Micro SDHC/SDXC card reader
• Brightness (and the keys for it)
• Touchscreen
• Sidecar (Continuity and Handoff work too)
• Hibernation (it is working now!)

Conclusion

In conclusion, I hope there are no issues to your very own hackintosh quest. If there are problems or just want me to improve something; creating pull requests or issues are welcome! :)