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El Capitan does not like me starting Yosemite on a restart


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El Capitan DP Beta 5

Yosemite 10.10.4

Clover 3252

System Protection disabled.

 

If I only boot into El Capitan (restart) everything is fine

Problem happens after restarting into Yosemite then restarting back into El Capitan

 

Example:

start system into El Capitan

restart and boot Yosemite

restart and boot El Capitan - I get a kernel panic during startup - rebuilding caches fixes issue.

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I use actual nvram since my board supports nvram and no emulation.
 

I decided to delete all the efi-apple-payload variables using nvram -d efi-apple-payload...... for each listed variable

Also found I had a duplicate copy of AppleHDA,kext, same kext in /S/L/E and /L/E so eliminated the one in /L/E which was contributing to a KP if I rebuilt caches from terminal (not single user mode)

 

Solved the problem

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