• iMac M1 24" Teardown (ifixit)

"macOS Big Sur 11.5 includes the following improvements for your Mac:
- Podcasts Library tab allows you to choose to see all shows or only followed shows.

This release also fixes the following issues:
- Music may not update play count and last played date in your library.
- Smart cards may not work when logging into Mac computers with the M1 chip."

• MDM administrators can use the new SetRecoveryLock command to set a password on a Mac with Apple silicon that will be required to enter macOS Recovery.
• MDM administrators can now use the DeviceLock command to lock a Mac with Apple silicon with a six-digit PIN and an optional message.
• Resolves an issue where network extensions that require Rosetta 2 fail to load on first startup after a software update.
• Resolves an issue where System Profiler becomes unresponsive when collecting hardware data.
• SmartCard login no longer fails on Mac computers with Apple silicon when using the checkCertificateTrust key.
• Resolves an issue where MDM app installations may fail when using a proxy configured with a PAC file.
• Resolves an issue where Mac computers with Apple silicon boot to recoveryOS after using startosinstall -eraseinstall.

(Make sure you have a backup before updating. I reboot and update with no apps running. If using any 3rd party Security software, disable or remove it before updating, and make sure you have adequate free space on the volume. (Apple doesn't list required space for Big Sur updates, but lists 35.5GB or more for upgrades from macOS Sierra or later.) If you have trouble installing the update, try updating from Safe Mode. If all else fails, try downloading the full macOS install from the App store.)

A friend updated her M1 mini from macOS 11.3.1 to 11.5 OK (using Safe Mode boot). M1 Mini firmware version now 6723.140.2. (She never updated to macOS 11.4, so not sure if that had a FW update. Her M1 Mini firmware in macOS 11.3.1 was 6723.101.4.)

Check for feedback in Apple's Big Sur forum. (Replies may be in previous problem threads.)
And for M1 owners, also check the Mac Mini, iMac, MacBook Pro, & MacBook Air forums.

Articles on security fixes (long list)
• About the security content of Security Update 2021-004 Catalina
• About the security content of Security Update 2021-005 Mojave
  
  Download Pages for the Security Updates (posted Aug 5th, 2021)
• Download Security Update 2021-004 Catalina (build 19H1323) (1.44 GB)
• Download Security Update 2021-005 Mojave (build 18G9323) (1.79 GB)

• Safari 14.1.2 security fixes
  - Available for macOS Catalina and macOS Mojave.
  
  
• iOS 14.7 release notes
• iPadOS 14.7 release notes
• About the security content of iOS 14.7 and iPadOS 14.7
  
  
• tvOS release notes only has this info for 14.7:
  "This update includes general performance and stability improvements".
• About the security content of tvOS 14.7
  
  
• watchOS 7.6 release notes
• About the security content of watchOS 7.6

"Software version 14.7 allows users to manage timers directly from the Home app on iPhone and iPad. This update also includes general performance and stability improvements."

• Improves stability when exporting with certain macOS Language & Region preferences.

The July 19 Firefox 90.0.1 release notes lists 5 bug fixes.

• About lossless audio in Apple Music
  - How to listen to lossless on iPhone/iPad, Macs, & Apple TV 4K, and FAQ.
  
  
• About spatial audio with Dolby Atmos in Apple Music
  - How to listen to Dolby Atmos on iPhone, iPad, Macs, & Apple TV 4K, plus a FAQ.
  
  
• If you can't turn on or sign in to iMessage or FaceTime
  - was titled "If you get an error when trying to activate iMessage or FaceTime".
  
  
• (How to) Access and manage files in your iCloud Drive
  (originally titled "iCloud Drive FAQ")
  
  
• How to free up storage space on your Mac
  
  
• Use Apple Podcasts on your Mac
  
  
• About Ultra Wideband availability
  
  
• If your MagSafe power adapter isn't working
  
  
• If your external display isn't detected or appears blurry on your Mac
  (was titled "Get help with video problems on external displays connected to your Mac")
  
  
• If an alert says Face ID has been disabled on your iPhone or iPad Pro
  "What the message means
  Using diagnostics in iOS, Apple has detected an issue with your TrueDepth camera that might cause it to not function as expected. This won't prevent you from using your iPhone or iPad, but until your iPhone or iPad is updated or serviced, you might not be able to use Face ID, Animoji, Memoji, and some other features that use the front camera."
  
  
• (How to) Use Apple Podcasts on your iPhone or iPad
  
  
• (How to) Add a HomeKit accessory to the Home app

• Chrome 92.0.4515.107 Stable Channel Update (google)
  - includes 35 security fixes.
  
  
• iOS Chrome browser version 92.0.4515.90 (for iOS 12.2 or later)
  - See linked page for changes. (Also read user reviews.)
  
  
• Freeware VM VirtualBox 6.1.24 update.
  (There's a later version 6.1.26 from July 28.)
  - See Change Log for list of fixes & improvements.
  
  
• LG CX/GX/WX OLED TVs Firmware Update 03.23.15
  - post includes info and firmware update download links.
  
  
• LG ZX OLED TV Firmware Update 03.13.15
  - Applicable Models List also includes some LG NANO LCD TV models.
  - post includes info and firmware update download link.