MP 1,1-5,1 MAC Pro Stuck in High Sierra with Boot ROM Version:144.000

[MurdockMan]

Hi!

Mac Pro 4.1 with Boot ROM Version:144.0.0.0.0

I have Radeon RX580 but not flashed, so can't see booting logo.

Trying to update to Mojave and stuck in the installation with: The recovery server could not be contacted. (downloaded from the App Store)

By the way, how I can install Mojave in the High Sierra partition without delete... just want to upgrade maintaining the same stuff already there.

From Mojave to Big Sur, need to use Open Core only?

Thanks for the help

 

[northernmunky]

You need to follow this:

but I think easier method I believe Apple re-released older OS's download with this fixed. If you download it via Mist it should work I think.

 

[MurdockMan]

Already see and tried the 2# option but can't see USB startup disk with the installation stuff.

Nope, can't run Mist in High Sierra... it's strange.