HOWTO: Keep Bluetooth devices paired across macOS AND Windows in Big Sur

I was trying to keep a Bluetooth headset working in both Windows 10 and macOS Big Sur, but none of the methods i found by themselves worked, after trying a combo of things I found a method that actually works! no outdated script downloads required :)

WHAT YOU'LL NEED:

• Hackintool (on macOS): Releases · headkaze/Hackintool · GitHub
• PSTools (on windows- install by dragging everything inside the PSTools zip into system32): PsTools - Windows Sysinternals | Microsoft Docs
• A USB (or just use google drive or something)

STEPS:

1. In windows, forget and re-pair your Bluetooth devices.
2. Now reboot into macOS and pair your devices again there.
3. still in macOS, open hackintool, navigate to utilities, and click the Bluetooth icon; it'll make a file called "bluetooth.reg". For me, it made it on my desktop. transfer the file to your USB or google drive.
4. boot back into windows and turn off Bluetooth, get your "Bluetooth.reg" file, install PSTools in system32, and then open CMD prompt as admin. Now type in: psexec -s -i regedit and hit enter.
5. When regedit opens, navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\BTHPORT\Parameters\Keys
6. Now right click on "Bluetooth.reg" and click edit; notepad will open up.
7. In Bluetooth.reg look for the key addresses that match the ones in regedit under keys. Click on the matching key address and inside, look for matching names between the bluetooth.reg and in regedit too.
8. For each matching name, right click on the name and modify in binary, delete everything, and type in the hex values from bluetooth.reg in. (Some guides say to reverse the order of hex but hackintool has done that already, so enter it in as is). Press OK and do this for all matching names.

I only had one device, my Bluetooth headphones, paired in both macOS and windows... Red is the key address and green is the name