High Sierra Firmware fails to install
hi, i’ve been trying upgrade yosemite 10.10.5 high sierra , have been unable install new firmware.
"to install macos high sierra, firmware update required.” section select “shut down”
click button, computer shuts down, boots ding, grey apple screen appears, shuts off , boots second time, , every time after it's done firmware has not been changed or updated @ all.
i’m running model macpro5,1
i’ve tried having reboot holding shift. lets me reinstall 10.10.5, , have didn’t help
i’ve rebooted holding command+r did not help.
have deleted highsierrainstaller , gotten new copy app store, didn’t seem help.
i’d grateful help, , try respond quickly
thanks!
attached files:
do have high sierra installer downloaded already?
if so, i'd suggest this:
- usb flashdrive 16gb or larger.
- download 1 of following free apps: "boot buddy", "diskmaker x", "install disk creator".
- use app create bootable usb flashdrive version of installer.
- boot usb installer, , try things way.
Forums Macs macOS macOS High Sierra (10.13)
- iPhone
- Mac OS & System Software
- iPad
- Apple Watch
- Notebooks
- iTunes
- Apple ID
- iCloud
- Desktop Computers
- Apple Music
- Professional Applications
- iPod
- iWork
- Apple TV
- iLife
- Wireless
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