iOS 17.2.1 Update: Features, Bugs & Battery Life

iOS 17 Update and Features

The recently launched iOS 17 update has brought a lot of new features and enhancements to the iPhones, offering more convenience and security to the users. Apple releases the iOS 17 update in three different versions: Stable, Public Beta, and Developer Beta.

While the beta and developer beta versions are released weekly, the stable version is launched after all the bugs and issues from these beta versions are resolved. So it is bug-free.

What is the iOS 17 Update?

iOS 17 is the seventeenth major release of the iOS mobile operating system developed by Apple Inc. It was announced on 5th June 2023, at the Worldwide Developers Conference (WWDC23). This update goes through three phases: developer beta, public beta, and stable release.

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iOS 17.2.1 Update

iOS 17.2.1 is the latest stable version for iPhones, and it was released on December 19, 2023. This update, which is about 223 MB in size, has the build number 21C66 and includes modem firmware version 1.22.05. As for performance, the iPhone 15 Pro Max scored 2941 in single-core and 7278 in multi-core tests on Geekbench, a tool that measures a device’s processing power.

Release Note:

  • Fixes for key security issues.
  • Resolved small bugs.
  • Corrects errors with the new syncing feature in Messages on iCloud.
  • Addresses issues with the Weather widget incorrectly changing locations.
iOS 17.2.1 Update
VersioniOS 17.2.1 Stable
Build Number21C66
Modem Firmware1.22.05
Update Size222.8 MB
Release DateDecember 19, 2023
Geekbench Scores (iPhone 15 Pro Max)Single-core: 2941
Multi-core: 7278

iOS 17.3 Beta 1 Update

Apple just rolled out its newest iOS 17.3 Beta 1 update, and it’s pretty exciting! The update is a hefty one at 6.39GB, and it was released just yesterday, on December 12, 2023. The modem firmware in this update is 1.40.00, and the build number is 21D5026f. Apple seems to have packed this update with some cool stuff, especially focusing on keeping our devices more secure.

Stolen Device Protection

The highlight of this update is the “Stolen Device Protection.” I know how worrying it can be when you think about your iPhone getting stolen. But with this new feature, you can breathe a little easier. If someone swipes your iPhone and tries to change the password or turn off “Find My.” Then This feature adds an extra layer of security. Even if they have your iPhone, they won’t be able to mess with your Apple ID, FaceID, or other key features, especially when you’re away from familiar locations.

iOS 17.3 Beta 1 Update
VersioniOS 17.3 Beta 1
Build Number21D5026f
Modem Firmware1.40.00
Update Size6.39 GB
Release DateDecember 12, 2023
Geekbench Scores (iPhone 15 Pro Max)Single-core: 2927
Multi-core: 7026

iOS 17.2 RC Update

With Christmas right around the corner, Apple has released the final beta version of iOS 17.2 RC for all developer and public beta users. This means we can expect the new iOS 17.3 Beta 1 with fresh features during the Christmas holidays.

The iOS 17.2 RC update carries the build number 21C62 and, as usual, is a hefty download at 6.39GB. Regarding modem firmware, there’s no update this time, and Apple hasn’t announced any Wi-Fi-related issues. However, this new RC update packs several secret hidden features and bug fixes – details below.

Release Notes:

  • New Weather & Clock Widgets
  • New Moon Calendar in Weather
  • New Wind Map in Weather
  • Siri can now access your Health App data on your iPhone and Apple Watch
  • Improved focusing speed for the telephoto camera on the iPhone 15, especially for distant objects.
  • New Spatial Video feature for Apple Vision Pro in 3D, available in the iPhone 15 Pro camera app
  • Easily share boarding passes and movie tickets using AirDrop.
iOS 17.2 RC Updates
VersioniOS 17.2 RC
Build Number21C62
Modem Firmware1.22.05
Update Size6.39 GB
Release DateDecember 06, 2023
Geekbench Scores (iPhone 15 Pro Max)Single-core: 2938
Multi-core: 7295

Old iOS 17 Updates, Build No & Modem Firmware

VersionBuild No.Modem FirmwareRelease Date
iOS 17.2 Beta 421C5054b1.22.05November 28, 2023
iOS 17.2 Beta 321C5046c1.22.05November 14, 2023
iOS 17.2 Beta 221C5040g1.12.02-1November 09, 2023
iOS 17.1.1 Stable21B911.12.02November 07, 2023
iOS 17.2 Beta 121C5029g1.22.01October 26, 2023
iOS 17.1 RC21B741.12.00October 17, 2023
iOS 17.1 Beta 321B5066a1.12.00October 10, 2023
iOS 17.0.3 Stable21A3601.00.03October 4, 2023
iOS 17.1 Beta 221B5056e1.12.00October 3, 2023
iOS 17.1 Beta 124B5045h1.11.00September 27, 2023
iOS 17.0.2 Stable21A3512.08.02September 26, 2023
iOS 17.0.1 Stable21A3402.08.02September 21, 2023
iOS 17.0 RC21A3292.08.02September 18, 2023
iOS 17 Beta 821A5326a2.08.02August 29, 2023
iOS 17 Beta 521A5303d2.08.01August 9, 2023
iOS 17 Beta 321A5277h2.04.01July 5, 2023
iOS 17 Beta 221A5268h2.04.00June 22, 2023
iOS 17 Beta 121A5248v1.80.00June 5, 2023

AirPods Latest Firmware Version

AirPods ModelFirmware Version
AirPods Pro (2nd generation) with MagSafe Charging Case (USB-C)6B34
AirPods Pro (2nd generation) with MagSafe Charging Case (Lightning)6B34
AirPods Pro (1st generation)6A307
AirPods (3rd generation)6A307
AirPods Max6A307
AirPods (1st generation)6.8.8

What’s New in the iOS 17 Beta Update?

  • The “Extend Wallpaper” feature enhances lock screen customization.
  • Favorite (star icon) integrated into Apple Music’s “Now Playing.”
  • Airdrop now includes a “Use Cellular Data” option for transfers without WiFi.
  • Exclusive “Cycle Count” feature in Battery settings for iPhone 15 Series.
  • Wallet app now shows real-time bank account balance (UK only).
  • Exclusive iPhone 15 Series Wallpaper introduced.
  • Home app features a new “Grid Forecast” for energy efficiency.
  • Advanced ProRAW and Resolution controls in camera settings:
    • HEIF Max (up to 48 MP)
    • ProRAW 12 MP
    • ProRAW Max (up to 48 MP)
  • Expanded iCloud storage options with 6TB and 12TB plans.

How to Download iOS 17 Update on iPhone

To download the iOS 17 update on your iPhone, follow these simple steps:

  • Open the “Settings” app on your iPhone.
  • Scroll down and tap “General”.
  • Tap “Software Update”, Your iPhone will now check for available updates.
  • If the iOS 17 update is available, you’ll see a description of the update along with the option to “Download and Install” Tap on it to begin the download process.
  • Once the download is complete, you can choose to install the update immediately or schedule it for later.
  • To install the update, tap “Install Now”. Your iPhone will restart, and the installation process will begin. This may take some time, so be patient.
How to Download iOS 17 Update on iPhone


In conclusion, iOS 17 revolutionizes user interaction with groundbreaking features and improvements, offering something unique for everyone. Its standout innovations, from the Apple Journal to advanced voice commands, set a new benchmark in smartphone experiences.