opencore efi for asrock x570 taichi hackintosh
you need to add your own platform data.the product is iMacPro1,1
base on opencore 0.6.5 release
support MacOS 10.15.7 and 11.1
bios only to do is close csm
do not enable above 4g decoding
bios version <= 3.0
first,clean nvram by opencore.
now do not set csr-active-config.please delete it,and then boot into recovery.
for 10.15, use csrutil disable to close sip;
for big sur,also need csrutil authenticated-root disable .
after that ,reboot into recovery and execute mount -uw /Volumes/BigSur\ Volume to make big sur system partition writeable.
use diskutil list to find which disk is big sur(not big sur data),it look like
APFS Volume macOS Big Sur 15.5 GB disk4s5
follow this command step:
diskutil apfs listSnapshots disk4s5
diskutil apfs deletesnapshop disk4s5 -name snapshotname
you may need many times of diskutil apfs deletesnapshop disk4s5 -name snapshotname util there is no snapshot
when all snapshot delete,you can restart.