Q: The update to 10.11.1 is hanging after about 3/4 of the installation - what can I do???

Exactly the same issue. I had to start up using cmd R and roll back to a time machine back up. Took 9hrs. I'm guessing I should probably not update to 10.11.1 until it is fixed.

yes don't upgrade - funny thing is I have friends that have upgraded without issues - seems to be only associated with unsigned Kext file/drivers !! Which some of us have - either way Apple dropped the ball on this one....

unfortunatly it is not possible to know what is the reason and exactly what to do. I started here in this topic with this problem in my MacMini 2011, which runs only exclusively Apple software. I use this computer as a server machine and I have absolutly no other softwares installed and I had this problem, only at the 3rd try out was solved, without knowing what was the reason for the failure!

the other 2 computers, 2x MacBook Pro also 2011, my inclusive has a lot of try outs softwares and ******** installed I had no problems at all, at the first try out updated as a clean blue sky

what I still advice is to keep your system backup, if you have this hanging problem, don't loose more time - restore your system back, build a USB drive with the El Captain.dmg (Apple teach it, or googling) and install it from a clean formated hard drive. then you can restore back the Applications or user preferences as you like it from your backup.

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what I still advice is to keep your system backup, if you have this hanging problem, don't loose more time - restore your system back, build a USB drive with the El Captain.dmg (Apple teach it, or googling) and install it from a clean formated hard drive. then you can restore back the Applications or user preferences as you like it from your backup.

IMO, a recent bootable clone of a healthy volume is a much better backup. With SuperDuper!, I can restore my whole volume (220GB) in one go in about 30 min. Of course, the other way works, too, but it takes longer, seems like it's more work, and you have to pay more attention to what you're doing.

Thanks a lot for sharing this solution. I had to (re)move twenty extensions or so, but that worked for me, finally!

Thanks again!

Once I got back to 10.11 I removed all of the offending Kext files as recommended, I had 65 and most were to do with various mobile 3G USB dongles.. I then upgraded to 10.11.1 without any issue. All working fine. Appreciate the invaluable help on this board. A most gracious Thank-you!

Hi all, this is just to let you know that after being more than desperate after a few retries what finally helped was deleting some old kexts (yah!).Good luck!

I'm DEVELOPING a kernel extension. I was upgrading to work on an issue in that extension in El Capitan. So uninstalling it seeems pointless to me.

Can you re-install their old extensions after upgrading to 11.1?

All, after waiting for ever for Apple to come back to me I moved the "failing and old" Kext files and bingo 10.11.1 installed.

My issue is now related to your question regarding Kexts - why was the update stalling in the first place and can or should I move Kexts back....

I will chase apple today and post what I get back....

Hi all. This might seem insignificant but after the update 10.11.1 loaded and after several reboots, I restored the kext files to the original folders. Some were rejected but the rest of them were restored. 7 days running n still counting, my Mac is in perfect shape.

Hi!  I had the exact same problem!  After many tries I revert to OS X Yosemite with my Time Machine!  Finally I ccould make it work again with Yosemite version.  That was my first Apple.  Let me tell you the deception I have now for that Apple Product.  All I hope is getting a fix from Apple soon! -- Elclolma  

Hi Francisco,

Thank you for you tips. Unfortunatly I am not able to boot after the smc reset nor am I able to use internet recovery (When i try to use internet recovery it finishes the download with the spinning globe after which the screen briefly goes black and then returns to the infinite grey screen) {the same it does at the 3/4 point during normal boot}. I tried booting from a 10.11.1 usb which didnt work either and I was unable to find the 10.11.0 file somewhere else online (the mac i used was running on 10.11.1 already). Do you have any other suggestions?

Kind regards,

Pim

Hi pimmim,

try more or less the same but by starting in Recovery Mode (Cmd+R), selecting terminal  and then going to the extensions dir to move old kext files to a new temp directory. Mine also wouldn't boot after SMC reset but apart from that everything was doable by using this way.

Good luck!

Hi papatpat,

Thanks for your suggestion. Unfortunatly the only difference when launching in Recovery Mode is that the installation progress bar shows up before I have to enter my log in credentials instead of after. The same issue occurs however, after about 3/4 of the progressbar the screen goes grey again and seems stuck forever. Any more suggestions?

Kind Regards,

Pim

last time an os x update failed (progress got stuck) it was due to a faulty ram-module

i recommend to run hardware check tool on your machine

after i replaced the faulty ram it worked as expected

that being said, in this case i dont think its the hardware, when i click reboot in os x it basically doesnt shutdown clean but crashes and reboots from there, so I cant install any patches because it never goes there...