u/Alternative_Fox7113

macOS Sequioa 15.7.7 on My Macbook Air 2017

1. use gibMacOS-master to download what you need macOS version on your Mac. my suggestion is macOS sequioa 15.5.7.
2. you can see https://support.apple.com/en-us/101578 how to create bootable USB SSD for install macOS on your Mac.
3. use opencore legacy Patcher 2.4.1 lastversion for install to your old mac with intel CPU.
4. when install down the opencore legacy patcher will auto update to 2.5.0 nightly version.
5. and remember do post-install Root Patch and reboot your's mac.
6. download the opencore legacy patcher 3.0 Nightly version for upgrade to 15.7.7.
7. https://github.com/Computer-genius1/OCLP-3.0-Tahoe-Archive/releases/download/Public/OpenCore-Patcher.pkg.1.zip
8. just use system performance --> system update check for upgrade to 15.7.7, maybe your's mac Wifi not working.
9. when upgrade all down to do opencore Patcher 3.0.0 Nightly Post-install Root Patch and reboot your's mac.
10. The wifi is working and all system performance is good.