Update 10.11.4 to 10.11.6 on MP 1,1

[danielaaron94]

So after two long weeks of trial and error i FINALLY got El Capitan 10.11.4 up and running on the old mac pro 1,1 WITH a boot screen.

Now i am extremely hesitant to install any further updates. Luckily the DMG i acquired was already 10.11.4, however, with automatic updates turned off, i have update 10.11.6 sitting in the app store.

My questions is, is it safe to install this update? I have been doing some research and i cant seem to find any info on this particular update being safe for an unsupported mac. Will it require CapitanPikeFix?

Also, I have Lion installed on a separate HDD, will i be able to replace the bootefi through lion worst case scenario?

 

[Zlobnick]

It should be safe or at least possible to update everything but this:

 

[danielaaron94]

It should be safe or at least possible to update everything but this:

Not true!!! The update killed my Mac

See my new thread

https://forums.macrumors.com/threads/flashing-“-”-folder-after-10-11-6-update.2176310/

 

[haralds]

So after two long weeks of trial and error i FINALLY got El Capitan 10.11.4 up and running on the old mac pro 1,1 WITH a boot screen.

Now i am extremely hesitant to install any further updates. Luckily the DMG i acquired was already 10.11.4, however, with automatic updates turned off, i have update 10.11.6 sitting in the app store.

My questions is, is it safe to install this update? I have been doing some research and i cant seem to find any info on this particular update being safe for an unsupported mac. Will it require CapitanPikeFix?

Also, I have Lion installed on a separate HDD, will i be able to replace the bootefi through lion worst case scenario?

Don't update. The security update requires an instruction set not supported by the older Xeons.