Notice: Updated to OC 0.6.4 and kexts. EFI currently works in Big Sur and Catalina

Issues (with OC 0.6.4):

• Opencore 0.6.4 has introduced an issue with BootStrap. Please follow the steps linked here. In the config I have set BootProtect to None, and RequestBootVarRouting is already enabled. So all you have to do it boot using BootProtect to None once, reset nvram and then set BootProtect to Bootstrap. (This step is unnecessary if you don't want Bootstrap, it is only needed if you run mutiple OS in your computer)

Changes I made:

• Using VoodooRMI instead of VoodooPS2Trackpad for Touchpad/Trackpoint. I've found this to be leagues better in terms of smoothness and gestures
• Disabled SSDT-SMBU and SSDT-Thinkpad_Clickpad patch for VoodooRMI compatibility. Also the clickpad patch didn't work for newer OC versions
• Switched to Vanilla OC instead of the modified one
• Added OpenCanopy support and Mac-like boot GUI
• Switched to MacBooPro12,1 SMBIOS and tweaked Power Management for better battery life. By switching we lose Wired Sidecar but it was very laggy and often unuseable, but we gained much better power management, thus, better battery life. If you want Sidecar, you can switch back to Macbook9,1
• Updated alc_fix for Big Sur
• Added YogaSMC kext to enable Fan reading. Control is currently not working, will update once it works.

Since this is a fairly vanilla EFI, if you want to add kexts/patches to it, go ahead, here's some suggestions:

• If you have Intel WiFi/BT Card, use OpenIntelWireless for WiFi/Bluetooth support. Works well with the 7265AC that comes with T450s, although it has a perticular issue with Bluetooth audio (AAC/aptX). Check this Issue for more information.
• For better battery life and thermal, use VoltageShift. I have a small guide here.
• I highly recommend HiDPI, use one-key-hidpi to enable HiDPI.

What's working

Everything works except for VGA (macOS doesn't support it), Sidecar (Processor doesn't support it) and SD Card Reader (unreliable kext).

Stuff that works: Proper touchpad with gestures, Function keys, Brightness, Power management, Sleep/wake, Wifi/Bluetooth, Airdrop, Instant Hotspot, Continuity, Import from iphone/ipad, MiniDP etc.

Utilities

Here I'll have utlities that are necessary or good-to-have for this computer.

For alc_fix, DW1820A Config and other, go to the folder Utilities to find detailed information on them.

VoltageShift

VoltageShift is one of the best tool to have lower temp and better battery life. *Note that this is a fairly advance tool and it can damage your computer if used without proper research. * Considering you understand the risk, let's go ahead and set it up:

• The kext needed is already in the EFI, disabled. first we need to enable it. Go to config.plist and change Kernel -> Add -> Item 23 -> Enabled boolean from NO to YES (Item 23 is not static, you just have to find the entry where you have VoltageShift.kext)
• Reboot. Then download and copy VoltageShift to /usr/local/bin

wget https://raw.githubusercontent.com/i3p9/Hackintosh-BigSur-Catalina-OpenCore-Lenovo-T450s-efi/master/Utilities/VoltageShift/voltageshift
sudo cp voltageshift /usr/local/bin

• Restart terminal and then check if voltageshift is working by voltageshift info
• If working, then you can undervolt your CPU by running voltageshift offset -90 (I don't recommend undervolting below -100mV, just do -90mV first, stress test to see if stable and then test -100mV)
• The undervolt will stick until the next reboot. So I suggest Automator/AppleScript to run it on boot. You can also use AppleScript to undervol/overvolt/switch turbo boost mode depending on what apps you're running/battery percentage etc.
  This was just the basic undervolt guide for CPU only. I highly suggest reading the Readme on the VoltageShift repo to learn mode about Undervolting and switching Intel Turbo Boost to on/off.

Big Sur Screenshot (Currently running Stable 11.0.1: