I too observed that firmware patching no longer worked after I upgraded to Big Sur. It all seems to go well until it tries to write the firmware. Same Kext was working nicely in the previous macOS version.
Since it never receives the END_OF_RECORD event it looks like the problem is here...
- Reading, reading, reading.... reading again
- Made sure no values from previous experiments were being re-used
- Unplugged the network cable until I was done
- Checked with iMessageDebug after every reboot until everything seemed in the right place and static after every reboot
- Used a...
After reading the guide like 10 times and doing *exactly* what is says (which seemed to be the hardest part for me :)) I finally managed to get Messages running again using Clover!
I didn't have to call Apple this time, it just worked. However, I called Apple once before a few months ago...
I've been using Clover for Mavericks without any problems. Even with some of the early Yosemite Public Betas my Hack just worked fine. However, the official version doesn't. Once the Yosemite installer should come up with the graphic installer screen my monitor just goes into power save mode...
Article: Troubleshooting iMessage Login Issues
It's because Hackintoshes are being used to send iMessage spam and this is Apple's way to combat it. It will flag your Apple ID once you log into iMessage with a generated serial which is usually not a valid serial even if it looks legit.
I got this one:
It uses an Intel 82574L chip which is natively supported in OS X. However, you need an Injector since the native kext is limited to a certain vendor/device id.
The Rosewill 64bit PCI-e NIC seems to be sold...
It looks like my 6870 boots just fine with these settings in Chimera:
This even worked with the installer, I didn't have to remove any kexts...
Oh I forgot: you'll need the Lnx2Mac drivers for Ethernet. Because I wanted native networking, I disabled the onboard NIC and replaced it with this one: Best Ethernet network adapter/NIC for a Hackintosh | trick77.com
ASUS P6T (non-SE, non-Deluxe, non WS Pro... just the plain old P6T)
DSDT is from FleeBailey (just leave all other stuff, most of it is outdated by now): The Flee's OSX86 Page: Update
The 6xxx cards require some special attention...