Then, you should be able to get to the Partition tab, and change the partition map to GUID.Ahead of time, prepare a bootable USB Flash drive with El Capitan on it. Remove all partitions through the Erase option. If you still find the option grayed out, that means your flash drive has a Master Boot Record (MBR) partition map. Then, the partition option will become active.(If you don’t create a partition, this process will use all of the available space on the drive, no matter how large it is.) Open the Recovery Disk Assistant application.UPDATED 2/14/21 – List of macOS Big Sur Installation Issues.Normally when you plug in an external hard drive to your Mac's USB port you will see it appear on the desktop (aka mount on the desktop). If the drive is larger than 1 GB, consider partitioning it to make a 1 GB partition for the recovery disk. MacOS Big Sur Install Issues Table of ContentsConnect a hard drive or USB drive to your computer. Macintosh video that goes over some of the known Big Sur Install issues.Now click Partition on the top toolbar. If you choose any other drive, the partition option will become unclickable. But dont worry, this page talks about the reasons for this issue, and how to fix USB flash drive not mounting on Mac without data loss even if external hard drive is not showing up on Mac.Launch the Disk Utility app on your Mac and highlight the hard drive icon under ‘ External’ (for external hard drives). However, if the USB flash drive is not mounted on Mac, you will lose access to the USB flash drive as well as to the data stored on it.
Partition Is Greyed Out In El Capitan For Usb Flash Drive Install The MacSlowness after upgrade to Big Sur – Other have reported that their Mac is very slow after upgrading to Big Sur. – Some users are reporting after a good install the Mac is stuck in an endless boot loop. Big Sur stuck in endless boot loop. Big Sur Install failing and bricking some older 13″ MBPro’s – Installation fails and the Mac has a black screen – Will not respond to any startup commands. Big Sur progress gets stuck mid installation – Black Screen with Apple Logo stuck or stopped progress bar Big Sur Full Installer.app Download Problems – “Installation Failed Error Occurred while installing the selected updates.” Install this package and it will put macOS Big Sur into your /Applications folder!This issue started around 2:00PM CST on Big Sur Launch Day. You can download the full macOS Big Sur installer directly from Apple’s servers via Safari.What this will do is download the entire InstallAssistant.pkg file. Big Sur Full Installer.app Download Problems – “Installation Failed Error Occurred while installing the selected updates.”UPDATE 11/27/20 – I’m still getting a bunch of people reaching out saying that they are still getting the error even after Apple fixed the issue! I have a fix for you via Hyram Hakkenbecker. If more trending issues come in, they will be posted here.1. If you can’t unlock settings in System Preferences Big Sur 11.1 Big Sur Upgrade Error – An error occurred preparing the software update. Try to boot into safe mode. Discussions.apple.com/thread/252033547Other users have reported that after installing Big Sur, their Mac will be in an endless boot loop.What should you do if this issue happens to you? Discussions.apple.com/thread/252033190 Discussions.apple.com/thread/252040614 Forums.macrumors.com/threads/macos-big-sur-update-bricking-some-older-macbook-pro-models.2268438/ Reddit.com/r/MacOS/comments/jue7n5/big_sur_update_bricked_mid2014_13_mbp/ Are any apps or processes taking very large amounts of memory or CPU? If after a while the system is still slow, open up activity monitor and click on the CPU or Memory tabs. Wait! It’s possible that spotlight search is currently indexing and can take some time. The slowness is all over the system, including opening apps, Apple Menu and system preferences just taking a long time to load. Slowness after upgrade to Big Sur – Other have reported that their Mac is very slow after upgrading to Big Sur.I am starting to see a decent amount people say that after updating to macOS Big Sur from macOS Mojave or Catalina has caused a bunch of weird issues including slowness. Maybe it’s an 3rd party application that has installed a Kernel Extension or a LaunchDaemon that is causing the issue.5. Almost all of them had a fresh install. I have macOS Big Sur running on a bunch of Macs even all the way back to the 2014 model. Still having issues after checking everything? Backup your data and perform a fresh install. Motherboard was replaced, got it back intermittent wifi/Bluetooth, then finally flickering screen!! insert 40-50 phone calls 5-6 store visits = new mbp! (Time spent is probably cost laptop)Unbox new laptop, login to iCloud. The issue requires a 2nd Mac to fix!I go over the issue in the article below.This is a replacement after a year’s worth of complaining of a 2019 mbp. Please try again.If you try to reinstall macOS on your new M1 Apple Silicon Mac you will get an error. Failed to personalize the software update. Reinstall macOS Big Sur on Apple Silicon Mac = An error occurred preparing the update. Said engineer asked me to plug Ethernet cable into my laptop hahahaSafe to say I finished the call, so I created a bootable installer as after installation I can not get access to recovery mode as this crashes too!!Attempted that multiple times which also failed. Customer relations, who I’ve been dealing with for past 3-4 months ask me to talk to their senior engineer. On each crash screen temporally shows distorted Apple logos across the screen with lines. This is a 2021 mbp and they ship them with older OS, just shows what they think of it!!Installation sticks, then crashes. Speco player for macFigured the only option left was to erase hardrive and start from scratch with Catalina. Well glad I did as used it as I used it to put new mbp into target mode. I luckily still have my faulty mbp!! Refused to send it to them for them to then send me replacement. ![]() OK …3) Software Update shows Big Sur as a possible update… Take 2. It does its thing, ask for a restart, does its thing some more, but opens up ultimately in the old OS without any message, other than Software Update that said “Your computer restarted itself for an update”. Here, it seems to me that Software Update’s prompt to suddenly restart was a recipe for disaster (?!).2) Then, I get the normal UI to start the new OS install. ![]() I use a 2019 MacBook Pro 16″ with BigSur 11.0.1. Then when i plug in the enclosure this process starts again but the ssd still doesn’t show up. I found the following process in the activitymonitor ThunderboltAccessoryUpdaterService and killed it. 2.13.3) on the other MacBook Air (M1) and the USB-c charging cable delivered with the machine, proofed futile. But when I attempted to transfer the user from an older MacBook running Mojave to the other one, the new MacBook Air was bricked! Subsequent attempts at reviving it, using Apple Configurator 2 (ver. On the first one I managed to transfer the user from an older MacBook Air running Catalina. I hope for a soon update, which fixes this error, but maybe someone has a tip who had the same problem.I recently bought two MacBook Air (M1) computers. Since I took Big Sur as an occasion to rebuild my system to get rid of old burdens, so my system is relatively fresh.
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