How to downgrade the Kernel from 18.6.0 to 18.2.0?

[DeppJones]

Is there a way to downgrade the Kernel from 18.6.0 to 18.2.0 on 10.15.5?

My Mac Pro 4,1 flashed to 5,1 has a massive audio stuttering in iTunes and it could be solved on 10.14.4 by changing the Kernel from 18.5.0 to 18.2.0. After the update to 10.15.5, the stuttering is back but the exchange of the Kernel does not longer work. Is there a new safety/protection feature in 10.15.5 that prevents the exchange of the Kernel?

 

[chrfr]

Is there a way to downgrade the Kernel from 18.6.0 to 18.2.0 on 10.15.5?

My Mac Pro 4,1 flashed to 5,1 has a massive audio stuttering in iTunes and it could be solved on 10.14.4 by changing the Kernel from 18.5.0 to 18.2.0. After the update to 10.15.5, the stuttering is back but the exchange of the Kernel does not longer work. Is there a new safety/protection feature in 10.15.5 that prevents the exchange of the Kernel?

If you're downgrading the kernel you should be downgrading the entire operating system, since that's basically what you're doing anyway.

 

[DeppJones]

If you're downgrading the kernel you should be downgrading the entire operating system, since that's basically what you're doing anyway.

Unfortunately, that didn't answer my question(s)...

 

[chrfr]

Unfortunately, that didn't answer my question(s)...

The kernel is protected by SIP, as it's been since High Sierra.

 

[DeppJones]

The kernel is protected by SIP, as it's been since High Sierra.

Ok! If I boot 10.14.4 from another partition and change the kernel of the 10.14.5 there should be no problem with the SIP, right!? Where comes the 18.6.0 in system information from, even if I deleted the 18.6.0 kernel and copied the 18.2.0 instead???

 

[haralds]

Other partition boots might still honor SIP based on their version.
You can disable SIP by booting into Recovery, opening Terminal from the Utilities menu, and typing csrutil disable.

I would never just change the kernel. There are likely to be private API changes that make your system unstable. Reinstalling an older version of the OS is much safer.