Mojave - "An error occurred installing macOS" error

I have the same problem. I tried all. Reset with command R, start by USB key, remove security firewall.

I think there is a problem with T2 but I don’t know the solution. The log file write “bridgeOS update prepare failed”.

Guys, I have a solution. First, download the supplemental update 2 for High Sierra 13.6. If you have problem downloading the supplemental update, don't use wifi. Use a gigabit ethernet instead. I am pretty sure you will be able. to install MacOS Mojave after that. This method worked for me.

I found this:

"It seems that many people have gotten confirmation from Apple that this is an issue with the T2 chip.

I would STRONGLY advice you to stay on whatever OS you are running now, do NOT try to install Mojave or reinstall the OS you are running. Even the people who have gotten it to work are experiencing several bugs with Mojave. If I were you, I would wait until Apple releases a patch for the OS so that it works with the new MBP:s. Thanks for all the insight everyone!"

is it true?

Hi, I have the same problem as you, and I think it caused by the T2 chip at first time too. I solved it by reset all the proxy in the network setting and shut down all the proxy application. After that, reinstall the mojave-upgrade application and it works

1.Apple->System preferences->Network->WiFi->Advanced...->Proxies->clear all the options->OK

2.Check if all the installed proxy application shut down ( I uninstalled them)

3.Delete Install_macOS_Mojave.app

4.Reboot and try to install it again

Hope this helps～

I was able to get the installer to complete (got past the 15 seconds remaining prompt), and it appears to be working.

Here’s what I did to get it going:

I turned off my VPN, and set it so that it did not start on login.

I then reset my network config so that I had zero boxes checked in the proxy menu.

I then shut down, and reset my SMC.

Finally, I downloaded a new copy of the installer from the App Store, and ran it.

If I had to guess, I’d say that the installer doesn’t play nice with any VPN software, and an SMC reset is required thanks to the T2 chip.

I've been dealing with Apple support for more than a 2 weeks.

Nothing so far.

All the usual stupidity, reset the SMC try installing it from Recovery .... nothing worked for me

I have MBP 2018 with the T2 chip and this looks like the problem.

There are so many people having this issue and Apple keep telling us to reset our laptops this should fix it!

This is rediculous Apple just fix it!

Hi All,

So I worked closely with a senior support team member (Thanks, Dean!) for the past week on this issue and I managed to resolve it.

First off, I run VyprVPN, Spoof-Mac (don't ask) and BitDefender.

Now, when I attempted to install Mojave the first time, I encountered an error similar to, if not identical to what has been described here, purportedly related to the BridgeOS failing to personalize and installation falling over with a non-descript error message (throwing codes such as 602, 204).

I captured my system data and sent it over to an engineer and he pointed me to my network connection is the likely root cause. The first suggestion was to create a new network location and test, then create an admin user account and try again, and also attempt to install after disabling/uninstalling any VPN, anti-virus or other network traffic manipulating software (including things that mask hardware addresses) and my firewall.

I also whitelisted *.com.apple.* addresses, and whitelisted the Mojave Installer in my network settings.

None of this worked for me.

However, I did make a significant change to my VPN configuration which finally allowed the installation to complete.

VyprVPN uses a proprietary protocol known as Chameleon which is an encrypted connection masked to outwardly appear as regular traffic. Basically, a VPN designed to not appear to be a VPN (this is to avoid the usual scanning done by certain ISP's, websites or government internet gates that would flag this kind of traffic and restrict or otherwise hinder it). By switching my VPN protocol to OpenVPN (still 256 encrypted but no longer outwardly appearing and regular traffic), my BridgeOS personalization step was able to complete and my installation progressed and finished without issue.

My suspicion is that Apple's listener has a decision tree on incoming connection attempts based on the traffic. As the installer sent its request under Chameleon protocol, I doubt there was any decision in place to handle an Apple installer connection coming in encrypted, looking un-encrypted.

Hopefully, this helps some of you all out!

update, i went to piazza liberty in Milan, the Macbook 2018 did not update because there is a important hardware problem. Now i should wait the new piece from US and they haven't gave me a date for the close de issue. now i am waiting without my mac and i have a work that i should close.

it is very strange because the Mac’s internal tools said that it was ok.

SMC reset doesnt work for me

See link for more info

Re: Problems upgrading to macOS Mojave on MacBook Pro 2018

I'm having the same issue on my 2018 15" MacBook Pro

Same here.

Same here