Thanks for the reply, what you did gave me an idea. I needed to try and install AppleSDXC.kext from Mojave into my Big Sur. but its not as simple as it used to be and you can't inject it with opencore it'll just cause a panic. I used Command Line SnapShot Mounter-V2 from github to install the Mojave version kext into my Big Sur S/L/E. **Note you must first disable sip** Once that was all done and rebooted all the different Micro SD cards were working regardless of brand.
