I will warn you, though: Microsoft Outlook is not compatible h.480 GB Crucial BX SSD (it is currently in Optical Bay, since my HDD flex cable is not working and the original HDD slot is empty).So the issue is when I try to install Mac OS High Sierra or above (till Catalina), it takes 15-20 mins and then I see an error as 'An error occurred while trying to verify firmware' and not allowing me to pass the OS installation.I tried directly installing from App store, tried via Bootable USB but for all the cases I get the same error. When I see that many people dont have troubles installing the latest OS (Catalina) in the Mid 2012 Version (Non Retina model), why am I having troubles in installing. I read in other forums that this might be due to APFS formatting of the disk but I dont get that option while formatting via Disk Utility as I use Sierra. Also, read as Mac will automatically update the firmware and format as APFS while moving to High Sierra.Is it because I dont have a drive in my original HDD Bay is not allowing to update the firmware? Or could there be any other issues.I badly in need of an OS update as the Office products and other Softwares aren’t compatible with Sierra and it is sometimes affecting my tasks.Please help me guiding a solution for this. Ref: IM02 Apple iMac late 2012 Intel Core i7 CPU Running OS High Sierra 16GB RAM 1TB HDD.MacBook Pro 2012 or later Mac mini 2012 or later iMac 2012 or later iMac Pro (all models).Check your Mac model – Not all Macs, especially old ones, are able to upgrade. I hope you find them helpful.Also Read: macOS Monterey Slow Fixes Important TipsIf you have decided to update to High Sierra but have yet to do so, here are a few things (based on order of priority) I highly recommend you check out in advance so you can avoid potential problems.1. Because of our collective experience, I figured it would be a good idea to write an article listing common macOS High Sierra slowdown issues together with relevant solutions.My goal is simple: to save you time by helping you solve problems! Some of the issues below are what I personally suffered, while some come from stories of other fellow Mac users. However, the excitement has been gradually overcome by the issues I encountered — mainly, that it runs slowly or even freezes up during and after installation.Having immersed myself into countless Apple communities and forums, I found that I wasn’t alone. After waiting for my mid-2012 MacBook Pro to update for two days and nights, it’s finally on the latest macOS — 10.13 High Sierra!As a tech enthusiast, I was super excited about High Sierra and its new features. It is much faster in High Sierra, and it employs newer Metal 2 graphics.Plus, it’ll take you less time to back up. The more free space you have, the better. Clean up your Mac – Per Apple, High Sierra requires at least 14.3GB of storage space to perform the upgrade. You can view the specifics here.2.Update to 10.12.6 FIRST – This helps avoid an issue where your Mac keeps hanging in the “about a minute remaining” window. Time Machine is the go-to tool but you can also use an advanced backup app like Get Backup Pro which has several key features Time Machine doesn’t offer, such as bootable backups, the ability to select which files to backup, lossless compression, etc.4. Backup your data – It’s always good practice to backup your Mac once a while — or like they say, make a backup of your backups! Apple also recommends us to do that for major macOS upgrades, just in case. Also read our guide on the best Mac cleaner software.3. That’s the most effective solution I’ve found.
![]() High Sierra Book Pro 2012 Mac OS HighYou never how long it’s going to take. Choose the right time to update – Do NOT install High Sierra at work. You can learn more details from Issue 3 below.5. Here are two screenshots I took:Issue 2: Not Enough Disk Space to InstallPossible cause: The startup disk on the Mac that High Sierra will be installed on lacks storage space. During macOS High Sierra Installation Issue 1: Downloading Process is SlowPossible cause: Your Internet connection is weak.How to fix: Restart your Internet router, or move your Mac machine to a better location with a stronger signal.For me, it only took a few minutes for the download to complete before the installation window popped up. Plus, it takes more time to clean and back up your Mac — and deal with those unexpected issues like the ones I encountered.All done? Great! Now here are the list of issues and fixes you may reference in case problems show up.Note: it’s very unlikely that you’ll encounter all of the issues below, so feel free to navigate through the Table of Contents to jump to the issue that is exactly the same or similar to your situation. The installation process alone will take about two hours to complete (ideally). Mac disk cleanerThe quickest way is to use CleanMyMac to deep-clean your hard drive and Gemini to find and remove duplicates or similar files.For me, I didn’t encounter this error because my installation “Macintosh HD” has 261.21 GB available of 479.89 GB — 54% free!Issue 3: Freezes or Stuck at A Minute RemainingMore details: The installation stops while the progress bar shows it’s almost finished. It’s good practice to uninstall them as well. Also, unused applications could stack up. Check the partition for large files, deleting or transferring them elsewhere (especially photos and videos which tend to take much more space than other types of files). The “one minute remaining” issue never reappeared.Possible cause: You’re multi-tasking while High Sierra has yet to finish installing.How to fix: Open Activity Monitor and find resource-hogging processes. I then proceeded to install High Sierra. In about ten minutes, Sierra 10.12.6 was installed. I clicked the “UPDATE” button. But I was disappointed to see my Mac hang up again with the same error: Stuck at one minute left.So, I opened Mac App Store and saw that there was an update request (as you see from the screenshot below, thankfully I still have it). I canceled it, thinking my Internet had been disconnected, and re-tried. ![]() Initially, my Mac took at least thirty seconds to start up, but after the SSD upgrade, it only took ten seconds or so.How to fix: First, click the Apple logo on the top-left and select System Preferences > Users & Groups > Login Items. In case you wondered the speed difference, I replaced my MacBook hard drive with a new SSD and the performance difference was like night and day. The Mac is equipped with an HDD (hard disk drive) rather than an SSD (solid state drive). The startup disk on your Mac has limited available storage space. Your Mac has too many login items (apps or services that automatically open up when a Mac boots up). □ After macOS High Sierra is Installed Issue 5: Running Slow on Startup Possible causes: Under “Cursor size”, make sure it points to “Normal”.Issue 7: App Crashes or Can’t Be Opened upon StartPossible cause: The app is outdated or incompatible with High Sierra.How to fix: Check the app developer’s official site or Mac App Store to see if there’s a newer version. Go to System Preferences > Accessibility > Display. Issue 6: Mac Cursor FreezesPossible cause: You enlarged the cursor size.How to fix: Adjust the cursor to normal size. Seriously, Macs with SSDs are much faster than those with HDDs. You’ll see a colorful bar like this showing you the usage of your hard drive (or flash storage).Clicking on the “Manage” button gives you a detailed overview of what types of files are taking up the most storage — which is often a direct hint as to where you should get started cleaning up your Mac.For me, I didn’t notice much speed lag after updating to High Sierra, probably because my Mac had an SSD already (its default Hitachi HDD died last year) and it only takes ten seconds or so to fully boot up. Highlight those unneeded items and click the “-” icon to disable them.Then, check whether or not the startup disk is full by going to About This Mac > Storage. Issue 8: Safari, Chrome, or Firefox Slow This article has more information on that. Please quit and restart the application”, you may need to repair the Photos library. Download qr code reader for macHere you’ll see the plugins you’ve installed. For example, on Safari, go to Preferences > Extensions. Same with Chrome and Safari.Also, remove unnecessary third-party extensions. Take Firefox for instance — click on “About Firefox” and Mozilla will auto-check whether Firefox is up to date. Your computer is infected with Adware and your web browsers are being redirected to suspicious websites with intrusive flash ads.First, run an antivirus to check if your machine has been infected with malicious software or Adware.Then, check if your web browser is up to date. You’ve installed too many extensions or plugins. A cluttered desktop can seriously slow down a Mac. Many of us are used to saving everything on the desktop, but that’s never a good idea. Declutter your Mac desktop. In general, the fewer extensions enabled, the smoother your browsing experience would be.How to Improve Mac Performance with High Sierra ![]()
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