Can't really remember the correct order, but it won't hurt if you flash fstab out of it.
What I remember, absolutely not mandatory, was:
Flash rom and booted
Next flash kernel, again booted
In recovery change file system of data and cache. Obviously this wipes the partition, backup your data.
Rebooted recovery, copyed fstabs, flashed, and done.
I think I flashed patch before and after changing file system, but no harm done. File attached.View attachment fstab_patch_F2FS_MI9_Cache_NoBarrier.zip
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