Thank you for your answer.
So, I have the EFI from this site, the new ssdts, NVRAM is as iMac19.1.
In fact, I can also boot Catalina 10.15.6 beta! Brilliant!
I still have the "USBZ390GamingM.kext." because I thought it supports the chipset.
Unfortunately, error messages...
no matter what I do:
USB.kext edited with hackintool,
or these boot args:
-v keepsyms = 1 debug = 0x100 alcid = 7 -lilubetaall booter-fileset-kernel booter-fileset-basesystem
come this error message as can be seen in the three pictures!
Archiv.zip