Newsroom Updates

> Introducing Apple Intelligence for iPhone, iPad, and Mac

> macOS Sequoia takes productivity and intelligence on Mac to new heights

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

myvinge Author

Level 1

8 points

What if there is a power cut during an OS upgrade?

Hi,

I was wondering what happens if the power (in my house) goes out during an OS upgrade?

(No worries about the mac since it's got a battery, but I was thinking about internet connection.)

-Will the process restart itself once the power comes back, or do I need to fix something..? And if I need to do the restart - how do I do that?

Also, could someone give me a hint on how long it takes to update to Big Sur from Catalina?

Is it like four hours, or more about nine..? (Given there's no power failure.)

Thanks a lot! (in advance - I trust you :)

Milla

Posted on Aug 9, 2021 6:49 AM

Best reply

PRP_53

Level 10

86,101 points

Posted on Aug 9, 2021 6:55 AM

If power to Router is lost during the download process - it will stop and AFAIK - will have to start from the beginning again.

Suggest using an Ethernet Connection to Router for more reliable and steady connect speeds. If via Wifi - Disconnect all other Devices using the Wifi - want the Maximum Bandwidth only for this computer.

Depending on the Speed of you Connection will determine how long it is going to take.

View in context

What if there is a power cut during an OS upgrade?

Similar questions