Reviving a Late 2011 iMac: Clean Install of macOS High Sierra

Introduction

Today, we successfully completed a full clean installation of macOS High Sierra onto a Late 2011 iMac. The goal was to prepare the machine for gifting, leaving it at the Setup Assistant so the new owner experiences it like a new Mac. This blog post summarizes the journey, decisions, and technical steps taken.


Stage 1: Initial Problem

  • The iMac had a freshly erased internal HDD.
  • Attempted to install macOS Sierra from a standard installer.
  • Installation would nearly complete, then error out stating “An error occurred, please run the installer again.”

Key Suspicions

  • Potential hard drive aging issues.
  • Installer image corruption.
  • Time/date certificate issues.

Immediate Actions

  • Verified and corrected system date and time via Terminal.
  • Erased the drive properly using Disk Utility, ensuring:
    • Format: Mac OS Extended (Journaled)
    • Scheme: GUID Partition Map

Stage 2: Hurdles with macOS Sierra Installer

  • The available Sierra installer was an InstallOS.dmg, not a full Install macOS Sierra.app.
  • Due to being on a newer MacOS (Sequoia), the package inside could not be expanded or executed natively.
  • Decided that High Sierra would be a better solution due to its broader hardware support and smoother installation compatibility with Late 2011 iMacs.

Stage 3: Getting High Sierra Installer

  • Direct downloads from the App Store were blocked or incompatible.
  • Successfully used iBoysoft DiskGeeker to download a full macOS High Sierra installer.
  • Verified that the full installer (5.2-5.3GB) was obtained, not a stub.

Creating the USB Installer

  • Used DiskGeeker to create a bootable High Sierra USB stick.
  • Labeled and preserved the USB stick for future use.

Stage 4: Installation and Setup Preparation

  • Booted the iMac holding Option (Alt) key and selected the USB installer.
  • Used Disk Utility to:
    • Erase the internal drive properly.
    • Confirm format and scheme.
  • Installed macOS High Sierra cleanly.

Key Detail

  • Left the iMac at the Setup Assistant screen by pressing Command + Q and shutting down.
  • This ensures the new owner will experience the initial setup process themselves.

Final Reflection

This project showed that even older Macs can be revitalized with careful prep, the right tools, and a logical workflow. Understanding how newer macOS versions interact (or fail to interact) with legacy installers was key to success.

Key Takeaways

  • Always correct system date/time before installing older macOS.
  • Sierra installers via InstallOS.dmg are problematic under modern macOS.
  • High Sierra remains the best legacy installer for Late 2011 iMacs.
  • Leave gifted Macs at Setup Assistant for best “new user” experience.

Post Author: John Wagenvoort
Assisted by: Kai

New Life for 2011 MBP 17

Back in 2012 I purchased a refurbished MacBook Pro 17″ Unibody. (Refurbished due to the GPU having failed already but that’s another story)

This Macbook’s latest Apple supported OS was High Sierra. So some years ago already this machine was being passed by and less capable of running latest apps like Daylite and PDF Expert.

Along came dosdude1 with his sensational patcher for installing Catalina on an unsupported Mac. This allowed the MBP to continue being of useful service until last year when again Daylite and PDF Expert had passed it by.

So I bit the bullet this weekend and decided to give my MBP 17 an OpenCore Legacy Patcher – Sonoma xmas upgrade.

All I can say is that the entire process is so slick that it motivated me to write this.

If you have an old Mac and want to install a later or latest OS then check out; https://dortania.github.io/OpenCore-Legacy-Patcher/

Well worth a look.

Thanks to everyone at OpenCore.

Travelling Macs

So about every year I travel to Thailand and whilst there I need to stay connected and need to do a modicum of work.

Having landed at Bangkok airport I used to make my way to the “True” shop and invest in a data SIM card. This would usually set me back about 3,000 Thai Baht.

Last year I discovered that our Aussie service provider, Vodafone, (Go figure, a communications company can’t spell “phone”) offers roaming at $5 AUD per day. (Take note Telstra)

This then makes my remote office situation so much better. By being able to tether iPad & Macs etc. Not only that but I keep my number etc. Phone registrations with 2fa are also no longer an issue.

As for taking my MacBook Pro, Air OS I use rigid shell cases as made by Thule. Swedish made and absolutely sensational. No need to remove the computer from the case. A Satechi bluetooth keyboard and Logitech Maraton 720 mouse completes the package.

Keyboard and mouse you ask? Yes, Apple’s universal control has made the ability to use the Macs as simple as a dual screen setup, an absolute joy. (Most of the time)

A Samsonite computer / carry-on bag provides transport. Enough room for the three devices and the ubiquitous cables and chargers. That said, USB C is making that a little easier. Though hotels over in Thailand here need to catch up.

VPN is also a bonus. It allows me to connect to banking etc as if I’m in Australia. The latter only used if absolutely necessary.

My usual workflow whilst OS is to use Jump Desktop to connect to my Mac mini in the office. This is a lot more efficient data wise and also much more secure.

That’s it.

“Can’t Innovate Anymore my Arse”

When Phil Schiller uttered these words I thought he’d mozzed Apple from then on. Yeh, we had rounded corners since then. Even rounded corners on macOS windows. MacBook Pro’s that doubled as induction cooktops. (Only way to render a 4k video was to put the MBP in a freezer). Not to mention the sensational keyboard innovations. (Striving to make the MBP thinner than an 80gsm sheet of paper) reduced the keyboard to nigh on a touch screen (Oh wait, yeh, nah)

Finally then, hark some years later, we hit upon Universal Control. Yes! Innovation once again. I have my MBP M1, Mac Mini M1 with dual screens and my iPad, all on the same desk and I can control them all with one keyboard and mouse. (This will cut into keyboard sales so will it last?)

“Steve, this is simply sensational”. I say Steve, as I doubt Tim had anything to do with it.

Covid Times

Source – Unknown

Trace – Unlikely

Why? Politics!!

For the last year and a half the world has been struggling with Covid 19.

Melbourne is currently enduring a sixth lockdown. Politicians throughout Australia are posing / posturing as to who gives the better “Lockdown”. The ACT imposed a lockdown due to one case. Really?

Then of course we have the “non believers”. Yes, people who actually believe this whole scenario is a construct. Few words can describe them.

Most ominously, we have the antivaxers.

Who’d have thought? The “Enlightened Ones”. Words fail to explain what could possibly posses these air thieves to have such an opinion relative to subject matter they were never exposed to in an educational institution.

To all politicians and air thieves alike, I’d like to be able to travel before the decade is out.

The Traffic Cop

Soaking up the local culture in small village in north east Thailand is most probably best achieved during local community events. One of the more notable of these would have to be Songkran.

What historically started out as well wishing ritual and a passing on of good luck has transformed into a nationwide, three to five day water fight.

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What is not always obvious is how this event calls on local community members to help maintain a certain order. Now, the demands placed on theses certain individuals can’t be too onerous so as to not enjoy the festivities. The local constabulary will don colorful “Songkran” shirts and infiltrate the throng of revellers.

One such individual was a definite standout though and had to juggle the functions he was prevailed upon to perform. Hmmmm…… What to do, do I squirt the passers by with my water cannon or do I direct on coming traffic?

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All I can report is that there were no traffic accidents and definitely a huge number of soaked locals.

Songkran Day 1

Yesterday’s trip to Thailand was predominantly uneventful. Thai Airways was sensational as always and as much as I don’t sleep on planes the time seemed to pass quite quickly.

We arrived in Bangkok 6 am and the first order of the day was to obtain a SIM card for my beloved’s iPhone. This process has been made relatively easy as True now have a SIM card shop in the arrivals terminal. This just requires the owner of said device to remember their Apple ID and password. And that’s when the fight started…….

With SIM card issues resolved all we had to do now was meet up with our enterprising niece so we could off-load the near 15KG of lanolin creams and other skin enhancing products. Do check out PotterShopDirectfromUSA on Facebook.

With the import export rites out of the way it was only now that my wife realised airport personnel had singled out her suitcase with a “Heavy” tag. She seemed to be put out by this at first. I did impress upon her though, how lucky she was that Thai Air managed to get it on the same flight as us. Containers spring to mind……. (I did see “All Is Lost” last night and in the opening scenes I did think, “Hey that’s my wife’s suitcase”) BTW good movie.

Three hours later we were on a plane bound for Khon Kaen. I guess I could say that I’m now somewhat used to, no, dare I say, some what insular to being picked up from Khon Kaen airport. The event never leaves one with a feeling of normalcy and this time I was again greeted with a somewhat memorable event.

The main mode of transport here in North East Thailand would have to be without a doubt the ubiquitous pick-up. Available in all shapes and sizes, this vehicle fills a void in every Isan household. Our’s happens to have one with troop carrier accessory.

I have to side bar the ever memorable organisational skills of my wife and sister in-law at this time as without them it would have had five people arrive in Khon Kaen all at the same time. What’s the fun in that. 😄.

So not only was there no one to meet us at the airport when my wife and I arrived, we now had to wait three hours for the rest of the family to make their appearance. The locals were more appraised of our travel times than yours truelly. Or so it would appear.

When the troop carrier arrived I had to smile as twelve people got out to welcome five more with open arms. OK, I made the last bit up. They don’t welcome you with open arms. A simple sawasdee krup/ka and a smile will do.

Welcome home Johno……..

Last days in Ban Nong Pai

The last days have become a bit of a blur. There are activities to experience interspersed with protracted periods of absolutely nothing. I don’t know how the locals do it.

One of the major events of the week was a three day eating and drinking fest at the mayors house. His son is in the process of becoming a Monk and he was also honoring the passing of his other son some four years ago.

Of course as it goes here, any excuse for a free feed and a drink. Marquees were setup along with the mandatory sound equipment of course. This is where it pays to be the mayor of course as now the street was going to be impassable for the next three days. Not that anyone minded. If one happened upon the scene and determined they couldn’t get through they simply stopped and had a drink instead.

The last night was basically the coup de gras, as now the remaining intersection was taken up with a huge stage making ready for some live entertainment. The locals refer to this extravaganza as Lum Sing. Given that Isan has somewhat of a culture all of its own along with a strong dialect they have a stage show to show off these facets. Singers, dancers and of course the bamboo instrument (Can) players were in fine form.

Yours truly arrived and was given a VIP spot along with an ice bucket full of ice and a bottle of beer. Having performed live music myself and having a background in sound engineering I soon concluded that the sound dude for this show was deaf. Just like Beethoven used to lay his head on the piano to feel the vibrations, this guy used the kick drum as his cue. Every time the drummer hit the pedal on his kick drum the woofers of the sound system threatened to launch themselves into the crowd. I could actually feel the air pressure waves passing me each time. (Must bring ear protection next time). The locals didn’t seem to mind or notice. Then I remembered, they’re all deaf as well. My brother in law cuts floor tiles with an angle grinder without ear protection.

So given that we had put in a solid two hours listening to the diverse range of music I asked a very naive question, “When does the show finish?” This was around twelve o’clock and I was told that it would continue to at least three. So with that they gave me another bottle of beer. (warm of course). How do you ask for more ice in Isan?……

Lampao Dam – Songkran

Why do so many people here have pick-ups? Rot-gra-bah in Thia. The answer to the question soon becomes apparent during Songkran. Todays journey would have us make our way to Lampao Dam near Kalasin proper.

The vehicle of choice had been out fitted with a 150ltr tub filled with water. Small bowls and buckets were soon found and they too made their way to the back of the vehicle. The younger kids all clambered into the back with me included of course and we were off. Yes, I remembered my waterproof camera.

Lampao Dam is some 35Km from Ban Nong Pai and most of it can be travelled by way of the major roads at 80 Kph. However, what’s the fun in that? Better to take the back streets through the villages and see the locals throw water at the pick-ups. Note to self: Bring wetsuit next time.

It wasn’t long before all the water in our tub had been gleefully flung at passing motor bikes, other pick-ups, pedestrians and innocent bystanders. Now what? We’re out of water. Well, Thai ingenuity kicks in (or is it the ability to make a buck?) and we stopped off at a canal. There some guy had set himself up with a pump and for ten baht you can have your tub refilled.

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Off we went again. By now I was soaked through and through and had a generous lather of talc on my face. The latter being additional bonus relative to the passing on of good luck. The people at the side of the road will flag down the passing vehicles and touch each of the passengers faces with talc laden hand. This can of course get very messy given that everyone is wet. Farangs get priority I found.

It was great to see though that all of the antics are very light hearted. Nobody gets narky. How could you? If you complained you’d simply get another well deserved dousing.

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We did eventually arrive at the dam. Or as I dubbed it, “Kalasin Motor Show”. With the emphasis on pick-ups. It was here that I rediscovered another interesting Thai trait. They don’t use swimwear. No, I don’t mean that they’re into nude bathing. In fact truth be known, they’re the prudiest lot out. I mean they simply swim in their clothes. You might say, but they were wet already from the trip getting there. Well I’ve seen the same thing on beaches in Phuket. No real call for a swimwear outlet here I’m afraid. Swimming lessons wouldn’t go astray though. Although that would put the inflated inner tube hire dude out of business.

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And more Songkran

The destination of the day’s street parade was the local temple (Wat) and this was to be the venue for the evenings festivities as well.

When we arrived that evening we came upon a circular arrangement of chairs in front of a stage. By now I have concluded that the locals could all definitely use a hearing test as the parade’s amplification gear had been supplemented with even more gear. They obviously think that “stereo” means two of everything. The music had needless to say, an overwhelming presence.

The theme for the evening was some of community dance affair. The idea being that a financial contributor facilitates the ability for others to dance. The money is of course all put to good use I’m sure. Maybe the proceeds of this evenings event were going to be utilized to bolster the ever waining water supply.

Your’s truly was duped into (I mean selected for) making the first major contribution. It was an all in extravaganza with anyone and everyone displaying their cultural dance heritage and prowess. Others were on stage banging and clanging away (almost in time) along with the music.

Of course I was not going to get off as lightly as only making a donation. No, no, and after a lot of coaxing and a shot of VSOP offered up by local wearing a pith helmet, I entered the circle. The music began to play after I was introduced in English by the local teacher (why English when no one would be able to understand it) and before I knew it I was surrounded by Thai women. Not one of them under sixty five I might add. It was about now that all of those Discovery Channel shows started playing in my head. You know, those that deal with cultural courting rituals of sorts? It was then that I remembered that it’s OK for Thai men to be cradle snatchers and it’s frowned upon for Thai women to be cougars. Phew…..