This article lists the firmware versions of Macs that have been successfully upgraded to run macOS 26.0 Tahoe.
Apple doesn’t provide an official list of the current firmware versions which should be installed on each model of Mac. Intel models with T2 chips consist of two parts, the second covering iBridge in the T2. Apple silicon Macs just give an iBoot version.
Macs still running older versions of macOS are covered by information at:
The current EFI version is 2092.0.0.0.0 and iBridge is 23.16.10350.0.0,0.
Apple Studio Display
The current version remains 17.0 (build 21A329).
How to check your Mac’s firmware version
The simplest way is to run my free tool SilentKnight, available from its product page.
Alternatively, use the About This Mac command at the top of the Apple menu; hold the Option key and click on the System Information command. In the Hardware Overview listing, this is given as the Boot ROM Version or System Firmware Version.
What to do if your Mac’s firmware is different from that shown
If the version is higher than that given here, it indicates that Mac has installed a more recent version of macOS, which has installed a later version of the firmware. This is almost invariably the result of installing a beta-release of the next version of macOS. This occurs even when the newer macOS is installed to an external disk.
If the installed version of firmware has a version lower than that shown, you can try installing macOS again to see if that updates the firmware correctly. If it still fails to update, you should contact Apple Support.
Firmware updaters are now only distributed as part of macOS updates and upgrades: Apple doesn’t provide them separately.
All T2 and Apple silicon models automatically check the integrity of their firmware in the early part of the boot process anyway. If any errors are found then, the Mac should be put into DFU mode and firmware restored from the current IPSW image file. In Sonoma and later this can be performed in the Finder, and no longer requires Apple Configurator 2. Full instructions are provided in this article. If you don’t have a second Mac or don’t feel that you can perform this yourself, it should be easy to arrange with an Apple store or authorised service provider.
I hope that you enjoyed Saturday’s Mac Riddles, episode 325. Here are my solutions to them.
1: Not quite a dogcow functions in six modules from 1991.
Click for a solution
ClarisWorks
Not quite a dogcow (the name has an uncanny resemblance to Clarus the Dogcow) functions (works) in six modules (what it contained) from 1991 (when it was first released for the Mac).
2: Suite in three movements replacing 1 from 2004.
Click for a solution
iWork
Suite in three movements (Pages, Keynote and Numbers) replacing 1 from 2004 (when Apple started replacing AppleWorks, successor to ClarisWorks, with iWork).
3: Yoga position with syncopated music, but it wasn’t the sequel to 1-2-3.
Click for a solution
Lotus Jazz
Yoga position (lotus) with syncopated music (jazz), but it wasn’t the sequel to 1-2-3 (an early attempt from Lotus to reproduce the success it had with Lotus 1-2-3 for PCs on the Mac, it flopped badly).
I hope that you enjoyed Saturday’s Mac Riddles, episode 324. Here are my solutions to them.
1: Last edit from KeyGrip but not for the amateur.
Click for a solution
Final Cut Pro
Last (final) edit (cut) from KeyGrip (its original name when it was being developed by Macromedia) but not for the amateur (pro).
2: Movement to accompany 1 for its titles and effects.
Click for a solution
Motion
Movement (motion) to accompany 1 (it’s part of the suite) for its titles and effects (what it’s used for).
3: Opening that closed for your photos a decade ago.
Click for a solution
Aperture
Opening (an aperture) that closed for your photos a decade ago (it was Apple’s equivalent of Adobe Photoshop Lightroom, but was discontinued in 2015).
The common factor
Click for a solution
They have each been among Apple’s ‘pro’ apps for those working with still and moving images, and competitors for Adobe Premiere, Adobe After Effects, and Adobe Photoshop Lightroom.
I hope that you enjoyed Saturday’s Mac Riddles, episode 322. Here are my solutions to them.
1: It’s about evolution, and open source for 25 years.
Click for a solution
Darwin
It’s about evolution (when Steve Jobs announced Darwin as open source in 1999, he said this to link it with Charles Darwin), and open source for 25 years (first released as open source in 2000, and still being posted on GitHub). (Darwin consists of the open source components in macOS, and includes its kernel.)
2: If the kernel isn’t Unix, this is it.
Click for a solution
XNU
If the kernel isn’t Unix, this is it (XNU is the open source kernel within Darwin, and is available as part of the GitHub distribution. Its name is an abbreviation for X isn’t Unix).
3: Mud puddles in Pittsburgh misheard as the basis for 2.
Click for a solution
Mach
Mud puddles in Pittsburgh misheard (it was originally intended to be called Muck in honour of these, but was misheard and incorrectly written down as Mach) as the basis for 2 (the Mach microkernel, developed by Richard Rashid and Avie Tevanian, formed the basis of XNU. Tevanian went on to work at Apple, then NeXT, where he designed NeXTSTEP).
I hope that you enjoyed Saturday’s Mac Riddles, episode 321. Here are my solutions to them.
1: Where to sell an image of the Knolls in a two-year exclusive.
Click for a solution
Photoshop
Where to sell (a shop) an image (a photo) of the Knolls (originally developed by brothers Thomas and John Knoll, and licensed by Adobe) in a two-year exclusive (from February 1990 until its release on Windows in November 1992, it was exclusive to Mac).
2: Rembrandt, Claude Monet, JMW Turner and Corel.
Click for a solution
Painter
Rembrandt, Claude Monet, JMW Turner (all three were painters) and Corel (originally released in 1991 by Fractal Design, Painter was eventually bought by Corel).
3: One of the first two, it could be beige acrylic and written by Bill.
Click for a solution
MacPaint
One of the first two (together with MacWrite, it was one of the two apps bundled with the 128K Mac), it could be beige acrylic (paint the same colour as the 128K Mac) and written by Bill (Atkinson, 1951-2025, who wrote the app).
The common factor
Click for a solution
They have all been major raster graphics editors on the Mac.
To make its graphical interface work, the Mac needed a high-performance graphics system, for which the late Bill Atkinson (1951-2025) and Andy Hertzfeld designed and implemented QuickDraw. When it came to driving printers, though, Steve Jobs licensed the new page description language PostScript from Adobe, where it had just been developed by John Warnock (1940-2023), Charles Geschke (1939-2021) and others. PostScript is a stack-based interpreted language that could take many seconds or even minutes to image a page for printing, so wasn’t practical for doing much else at that time.
In the early 1990s, as desktop publishing became dominant among Mac users and we were all sending one another faxes, several companies recognised the need for a universal document format that could display laid-out text and graphics. Among them was Adobe, where Warnock formulated the aims of what he then referred to as Interchange PostScript or IPS, and so led the development of Portable Document Format. It’s telling that the final sentence of his proposal reads: “In any event corporations should be interested in site-licensing arrangements.”
When the first version of PDF was released in 1993, with its Carousel reader app, it faced competition from other similar ideas, and Adobe found itself competing against products including Farallon’s Replica, and Tumbleweed’s Envoy that gained the support of WordPerfect, then a popular cross-platform word processor. PDF didn’t become dominant until Adobe distributed its reader app free, rather than charging $50 for it as it had initially.
For many years, the only way to create really good PDFs was using Adobe’s Acrobat Distiller app, costing $695 for a single-user licence. That ingested PostScript files, created on the Mac by printing to a file, and transformed them into PDFs that could in turn only be read using Adobe’s software. Although PostScript was by then a prerequisite for all publishing work on Macs, it wasn’t until 1996, when PDF reached version 1.2 in Acrobat 3.0, that it captured the prepress market, which it consolidated in 1998 with the PDF/X-1 standard.
This is Acrobat Distiller 4.0 running on Mac OS 9.1 in early 2001, showing a few of its bewildering array of options for turning PostScript files into PDF.
At the same time, John Warnock’s aspirations for success in enterprise markets were being realised, and PDF steadily became the standard for fixed-format electronic documents, with the support of the US Internal Revenue Service and Adobe’s free cross-platform Acrobat Reader.
When Steve Jobs established NeXT in 1985 he must have become the only person to have licensed PostScript from Adobe twice, as NeXTSTEP adopted Display PostScript as the centrepiece of its graphics, developed collaboratively between NeXT and Adobe. At the time many thought this to be a mistake, as PostScript isn’t as efficient a graphics language as QuickDraw, despite Adobe’s efforts to accelerate it.
When NeXT and Mac merged to form the beginnings of Mac OS X in 1997, Display PostScript was replaced with PDF as the central graphics standard for both display and printing, in what was dubbed Quartz 2D. This was first demonstrated at WWDC in 1999 and lives on today in macOS. At the time, Apple’s in-house PDF engine in Quartz was one of few, alongside Adobe’s.
Prior to Mac OS X, Adobe Acrobat, both in its free viewer form and a paid-for Pro version, had been the de facto standard for reading, printing and working with PDF documents on the Mac. The Preview app had originated in NeXTSTEP in 1989 as its image and PDF viewer, and was brought across to early versions of Mac OS X, where it has remained ever since.
This PDF shows Apple’s original iPod promotional literature from late 2001.
Adobe continued providing its free Acrobat Reader for Mac OS X, here seen in 10.0 Cheetah.
The full paid-for version of Adobe Acrobat provided an extensive suite of editing tools, here in Mac OS X 10.1 Puma in early 2002.
By Mac OS X 10.3 Panther in 2003, Apple was claiming that Preview was “the fastest PDF viewer on the planet”, capable of navigating and searching text within PDF documents “at lightning speed”. This worked with the Mac’s new built-in support for faxing, which rendered received faxes in PDF to make them easier and clearer to access.
This is an early Keynote Quick Reference guide from 2003, viewed in Preview.
At that time, Preview was also able to convert Encapsulated PostScript (EPS) files and raw PostScript to PDF, so they could be saved in the more accessible format, and printed easily.
This page from the 9/11 Commission Report of 22 July 2004 is being viewed in Preview.
Acrobat Distiller remained an important component in Adobe’s paid-for product, even though Mac OS X was capable of generating its own PDFs. It’s seen here in Mac OS X 10.4 Tiger in 2005.
This is Acrobat Pro in 10.4 Tiger in early 2006, showing its long list of supported export formats.
Since those heady days, Preview has been relatively neglected. Revision of both the Quartz PDF engine and its API brought a spate of bugs that only abated with macOS Sierra. Preview has adopted an uncommon model for PDF annotations that often doesn’t work well with other PDF products, but it has remained very popular for completing electronic forms. Then, in macOS Ventura, Apple removed all support for converting EPS and PostScript to PDF, most probably as a result of security concerns, and their progressive disuse.
Although rumours of the death of Preview continue to prove unfounded, it’s unlikely to feature again as one of the strengths of macOS.
I hope that you enjoyed Saturday’s Mac Riddles, episode 319. Here are my solutions to them.
1: Successor to 3 inside a scheme was part of a popular atelier.
Click for a solution
InDesign
Successor to 3 (Adobe developed it to replace the ailing PageMaker) inside (in) a scheme (a design) was part of a popular atelier (for many years it was one of the leading apps in Adobe’s Creative Studio).
2: High speed subatomic particle took the lead in the 1990s.
Click for a solution
QuarkXPress
High speed (express) subatomic particle (a quark) took the lead in the 1990s (by the mid-1990s it had taken around 90% of the desktop publishing market on Macs).
3: Creator of a squire’s assistant was the first, but died before Mac OS X.
Click for a solution
PageMaker
Creator (maker) of a squire’s assistant (a page) was the first (released in July 1985 for the Mac), but died before Mac OS X (by 2000, it was moribund as Adobe was replacing it with InDesign, released in 1999, and it was never ported to Mac OS X).
The common factor
Click for a solution
They have all been leading desktop publishing apps for Macs.
I hope that you enjoyed Saturday’s Mac Riddles, episode 316. Here are my solutions to them.
1: From PageRank and 10^100 to a set of letters.
Click for a solution
Google
From PageRank (Google Search was founded on the patented PageRank algorithm for ranking search results) and 10^100 (its name is derived from the very large number googol, 10 to the power of 100) to a set of letters (in 2015 it restructured under the ownership of Alphabet Inc.).
2: A hooligan went from directory to search then declined into finance and news.
Click for a solution
Yahoo!
A hooligan (a yahoo) went from directory (it started as a curated web directory) to search (followed by a search engine) then declined into finance and news (what now remains).
3: After changing name three times, this directory has gone wavy.
Click for a solution
DMOZ
After changing name three times (originally GnuHoo, it then became NewHoo, almost ZURL, next Open Directory Project, before becoming DMOZ), this directory (it was a human-curated web directory) has gone wavy (DMOZ was superseded by Curlie in 2018).
I hope that you enjoyed Saturday’s Mac Riddles, episode 315. Here are my solutions to them.
1: It came with a tumbler from Camelot in 1993, then opened in 2008.
Click for a solution
PDF
It came with a tumbler (an acrobat) from Camelot (its original internal name) in 1993 (first released on 15 June 1993), then opened in 2008 (when it was adopted as an open ISO standard).
2: Replacement for 3 to avoid royalties with transparency has just turned three.
Click for a solution
PNG
Replacement for 3 (it was developed by Thomas Boutell and others to replace GIFs) to avoid royalties (those were imposed on GIFs because of their use of LZW compression) with transparency (it supports a transparency layer) has just turned three (its latest version 3.0 was released in June this year).
3: CompuServe animated its palette with 256 colours but we still can’t agree how to say it.
Click for a solution
GIF
CompuServe (released by CompuServe in 1987) animated (it supports animated images) its palette with 256 colours (it only supports palettes with 256 colours) but we still can’t agree how to say it (there has been a long-running dispute as to whether its ‘g’ is hard like ‘gift’ or soft like ‘gin’).
The common factor
Click for a solution
They were each intended to be portable, universal file formats.
I hope that you enjoyed Saturday’s Mac Riddles, episode 314. Here are my solutions to them.
1: Expedition for a panther now in visionOS too.
Click for a solution
Safari
Expedition (a safari) for a panther (it was first bundled with Mac OS X Panther in 2003) now in visionOS too (it’s now bundled in visionOS).
2: Polished plate is now 1’s most serious competitor.
Click for a solution
Chrome
Polished plate (chrome) is now 1’s most serious competitor (on Apple’s platforms, it is Safari’s main competitor).
3: Web pet only lasted a year before the exploder.
Click for a solution
Cyberdog
Web (cyber) pet (dog) only lasted a year before the exploder (released in 1996, it was dropped the following year, for Microsoft Internet Explorer to become the bundled web browser in Mac OS X).