High Sierra update frozen will not start up

pressed a combination and finally got access to my USB drive so hopefully I can restore. As for updating can I ever trust the Apple update system again ?

this as been a nightmare of unplugging and restarting trying all combination I thought it was just command plus r but no that just starting it looking for an Internet solution.

Update at your peril ! But will it go ok the next time ?

Well I restored but it must have updated the backup on the new install that fail so no good. Same screen with a frozen install of useless update. Not happy now trying to get restore back up again don’t seem to want to work again. This update as been a nightmare and from the start. Will leave till tomorrow now before I get too would up

Well after many hours my iMac is back up and running as for the update I am not sure if I will try again I can't lose my main workstation for hours again. Is the update duff I wonder otherwise why would it just freeze before the full install and screw the whole machine up, leaving me without a workstation most of the day

Well call me stupid but I tried the update again overnight. 8 hours later nothing the new freshly download update froze solid. Lucky enough after a few pulling plug and putting back in using fn, Ctrl, cmd and R I have started the restore progress once again.

How Apple as screwed up this update so much I have no idea but I think they should stop others downloading until it works for all. I wonder how many have wasted days on this like me. Hopefully after my restore I can once again get the use of my iMac again.

Update at your own risk !

After some research NOW my iMac is running again it seems the problem I have is being a Beta tester it's all to do with APFS so Beta testers cannot upgrade, Thanks Apple. So if your a tester and running 10.12.6 the upgrade will just freeze to stop this is complicated and as an OAP I am not up to something that sounds complicated

Thank You Once Again Apple, you could have sorted this out before offering the upgrade I am sure

Peter

Booted and used alt + command and keep getting internet download option so far cannot get a restore screen ?

I think it was

Fn + alt + cmd

If not

Ctrl + alt + cmd

It’s been a worrying afternoon to be honest.

Worst thing is will the next update work or just freeze up again ?

I got restore back and now restoring a backup from yesterday another hour to go.

Who else as had problems trying to install the new update I wonder.