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I have been spending a lot of time and money trying to get working wifi and Bluetooth on my Catalina 10.15.7 system, but I have had no success at all. Has anyone else done it? Or is it just not possible to use the board's built-in Intel® Dual Band 802.11ac Wave2 WIFI & BT 5?

It is an XFX 7870 2GB. It is fine with Catalina and It is supported under Big Sur but, could it be an issue?

So here's an odd thing. I couldn't get the machine to boot using the A520 board. Tried everything but that CSM just kept switching back to enabled. All other settings remained changed. So I thought I would switch back to the B450 board in order to make a Big Sur boot USB stick but the CSM was...

I flashed the bios to F13H and still the same issue. The odd thing is any other settings I change in the bios are saved just fine. It is CSM that keeps reverting to enabled even though I have disabled it and saved it. Maybe I need to crack on a do a completely fresh install of Big Sur rather...

Ok, so I tried your files, and still the same issue. If I let the machine boot on its own I just get the Gigabyte logo and nothing else. However here's an odd thing. When I go into the bios and disable CSM, save and reboot, it has changed back to enabled in the Bios! Same with Above 4G Encoding...

Moozuki, did you use the same case for your A520 build? I was thinking about using a G4 case myself.

Thanks for all that. I have downloaded the files and will try it later today. Even if it doesn't work I really appreciate your efforts to help :)

Ah, so it could be OC 0.6.8 causing a problem? Not sure where I find "Resizeable Bar"? I have heard it mentioned before but I forgot the context or where it was.

I updated the Bios on my B450 I to the latest version but then it would not even boot into my cloned Catalina drive. It just sat on the Aorus logo. Had to revert to the F50 bios and then it booted fine. I did check the settings after updating the bios by the way. There is something very odd...

Yeah, I can't figure it out. Theoretically, If I use your EFI, leave the type as MacPro1,1 then change the serial, board serial and UUID it should boot. It's a mystery. I will sort it eventually. It took me a few goes to get Catalina up and running. That was through trial and error but I had...

Thanks for the info etc. Right now I am stuck. I have two drives with Catalina installed. I keep one as a backup in case an upgrade goes wrong, which it has here. My main drive is the WD Blue SN550 500GB NVME M.2 2280 PCIe Gen3 SSD and that is what I have tried the upgrade from Catalina to...

Thanks for that. Is that useful even though it only goes up to OC 0.6.6 ?

I have been running Catalina 10.15.7 for some time now and apart from the usual things like wifi and Bluetooth not working it was ok. However, I wanted to install a fenvi 1200M Wifi/Bluetooth card but my B450 I has no PCIE slot for it. So I bought a Gigabyte A520M DS3H and Ryzen 3600. I...

Ok my bad. Just realised when looking at the first post that you are indeed running Big Sur! I think this may be the source of my problems. I am on Catalina 10.15.7 So I think the way forward is for me to attempt to upgrade to Big Sur whilst on my B450 I and then try swapping in the A520. The...

I have not yet done the update to Big Sur but I notice you said you have replaced the Wifi to Broadcom. The board doesn't have any slots for a PCIE card so I wonder how you did this. You mentioned BIOS: F51?

I have tried with 4G encoding disabled and enabled, also I always have CSM disabled. Can it be anything to do with the differences in graphics cards and memory? You have the Asrock Challenger Pro RX5600xt and I have the much older XFX 7870 2Gb card in my machine. Also you have 32Gb TeamForce...

Thanks for all your help with this. I tried that latest EFI you posted but all I get now is a black screen with the Gigabyte logo on it.

I updated to OC 0.6.8 and used your config.plist, adding a serial, board serial and UUID. But now on boot I no longer get to the Apple logo. I just see: "ocs no schema for apple event at 3 index" I assume there is a problem with the config.plist?

I don't think you posted your EFI, just the config.plist and the USB mapping?

I was going to try with your config.plist next. I do have my install cloned to another drive so if it all goes wrong I can revert to that :) My graphics card by the way is the XFX 7870 2GB. Old but it works fine in Catalina. I have attached my current EFI however I had to remove two kexts...