The Big Sur Compatibility Beta does not use the Mail plugin, and works perfectly fine on Big Sur, even if it's patched.
You just have to add `amfi_get_out_of_my_way=1` to your boot args.
`nvram boot-args="-no_compact_check amfi_get_out_of_my_way=1"`
This is what I have in my 15" 2012 MBPr, looks to be the same as the one recommended below and it does work well.
Bit more than $10 but well worth the effort I reckon.
Huge increase in throughput and negates the need to patch the kexts post install (the only kexts patched in mid 2012 A1398 ECM2512 are for the airport card) So after you swap out the airport card all of the hardware is natively supported in BS.
I have a post somewhere describing how to unpatch the kexts so you don't have to re install BS once you upgrade the card, let me know if you need it and I'll dig it out.
Heres the one sold in the Uk but it should point you in the right direction where you are.
Make sure it matches model, ECM, year and size and must be 802.11ac
https://www.amazon.co.uk/Broadcom-Bcm94360cs-Bcm94360csax-Bluetooth-Wireless/dp/B00PDN4H9E
Mine is A1398 EMC 2512 mid 2012 15" retina.
I experienced continuing problems with wifi, bt, airplay and randomly waking from sleep until I upgraded the wifi Airport card.
The one you want is the later 802.11 ac version which will eliminate all the above issues and does away with the need to patch any of the kexts. Everything is natively supported in BS once the Airport card is swapped out.
Broadcom Bcm94360cs Bcm94360csax Bcm4360.
Got mine from Amazon and took 10 minutes to fit.
https://www.amazon.co.uk/Broadcom-Bcm94360cs-Bcm94360csax-Bluetooth-Wireless/dp/B00PDN4H9E
oh sorry i thought you were on a macbook with a mac mini profile, you can try this but i dont know if it will work, it could just be the hdmi port or cable
Thanks I’ll definitely follow the steps!
Unrelated question,
https://www.amazon.com/Timetec-1600MHz-PC3L-12800-Pro13-inch-21-5-inch/dp/B00SNSKH7M
Is this a good ram for i5 MacBook 2012 mid 13 inch? Crucial one is like $95 and that’s like the best second options from Amazon with reviews ...