More for the groups sake than yours Laura, I want to repeat that to the best of my knowledge there is almost zero risk. It won't hurt having your iPhone plugged in but it is not necessary. The process works is as follows:
1) After clicking the upgrade button the upgrade is downloaded. This upgrade is what is know as a delta. That is it will be the difference between your current version and the new version so it is a small as possible. 2) After the download is complete, the upgrade will not proceed unless you have at least 50% battery life. This actual upgrade is a short process that requires a few minutes. A 50% full battery has many hours of life so the process will easily complete. So even though the download is potentially quite long, it will be allowed to proceed but the actual upgrade will not occur unless you have much, much, (much), more battery life than is required for the task. The maximum penalty for attempting an upgrade with too little battery is that you will need to download the upgrade delta again. The actual install of the delta will not proceed. If there were such a glaring flaw in the upgrade process many millions of the 200 million or so iOS users would be pounding the Genius Bar counters today. :-) I like you, Peter, have had to recover from a failed upgrade, but that was the result of a complex mix if iOS betas and provisioning credentials. It can also happen because of various mistaken Apple ID entries etc. So just to reiterate, plug in if it makes you feel happy but it is a requirement only for the download part. Cheers, Carlo On 09/03/2012, at 11:56 , Laura Webb wrote: > Hi Peter > > Thanks for your reply. > > More good advice but I was completely unaware of any possible implications. I > suppose I trusted Apple in offering the download as was. I shall be wiser > next time. > > Regards > Laura > > > > Sent from my iPad > > > On 09/03/2012, at 7:46 AM, Peter Hinchliffe <hinch...@multiline.com.au> wrote: > >> >> On 08/03/2012, at 10:22 AM, Laura Webb wrote: >> >>> Hi Peter >>> >>> I had a similar experience but did not even have to go through the >>> Settings. There was a message on the screen saying the update was available >>> so I just followed the prompts. Nor was my iPad connected to a power >>> supply. All done in a very short space of time. >>> >>> >> >> I have been through an interrupted iPhone upgrade once in my life, and I do >> not want to repeat the experience! Very unpleasant. I must admit that even >> if my iPad/iPhone were fully charged, I would still make sure it was >> connected to the power. Just minimising risk... >> >> Peter Hinchliffe Apwin Computer Services >> FileMaker Pro Solutions Developer >> Perth, Western Australia >> Phone (618) 9332 6482 Mob 0403 046 948 >> -------------------------------------------------------------------- >> Mac because I prefer it -- Windows because I have to. >> >> -- The WA Macintosh User Group Mailing List -- >> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> >> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> >> Settings & Unsubscribe - >> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
