You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.
Release Notes
It should be noted that these are the official release notes for the from Apple
AirTag and Find My
- Support for AirTag to keep track of and find your important items like your keys, wallet, backpack and more, privately and securely in the Find My app
- AirTag can be located by playing a sound via the built-in speaker
- The Find My network with hundreds of millions of devices can help you find your AirTag, even when it isn't nearby
- Lost Mode notifies you when your AirTag is found, and you can enter a phone number where you can be contacted
Emoji
- Support for separate skin tones for each individual in all variations of the couple kissing emoji and couple with heart emoji
- New face emojis, heart emojis, woman with a beard emoji
Siri
- Siri now includes more diverse voice options
- Incoming calls can be announced with Siri, including who is calling, when you're wearing your AirPods or compatible Beats headphones, and you can answer hands-free
- Group FaceTime calls are supported by asking Siri to FaceTime a list of contacts or a group name from Messages
- Emergency contacts can be called by asking Siri
Privacy
- App Tracking Transparency lets you control which apps are allowed to track your activity across other companies' apps and websites for ads or sharing with data brokers
Apple Music
- Share your favorite lyrics using Messages, Facebook, and Instagram Stories, and subscribers can play the snippet in Messages without leaving the conversation
- City charts showcase what's popular in over 100 cities from all over the world
Podcasts
- Podcasts Show Pages are redesigned to make it easier to start listening
- Option to save and download episodes, automatically adding them to your Library for quick access
- Download behavior and notification settings can be customized on a show-by-show basis
- Top Charts and popular categories in Search help you discover new shows
News
- Redesigned News+ tab enables Apple News+ subscribers to quickly find, download, and manage magazine and newspaper issues
- All-new Search experience that helps you find relevant topics, channels, and stories
Reminders
- Ability to sort reminders by Title, Priority, Due Date, or Creation date
- Option to print your reminder lists
Gaming
- Xbox Series X|S Wireless Controller or Sony PS5 DualSense™ Wireless Controller support
Fitness+
- Ability to stream audio and video content from Apple Fitness+ workouts to AirPlay 2-enabled TVs and devices
This release also fixes the following issues:
- Messages at the bottom of the thread may be hidden by the keyboard under certain circumstances
- Deleted messages may still appear in Spotlight search
- Messages may persistently fail to send texts in some threads
- Mail would not load new emails for some users until restarting the device
- iCloud Tabs may not appear in Safari
- iCloud Keychain could be prevented from turning off
- Reminders created via Siri may be unintentionally set for early morning hours
- AirPods audio routing to incorrect device for Automatic Switching
- AirPods Automatic Switching notifications might be missing or duplicated
For information on the security content of Apple software updates, please visit this website: https://support.apple.com/kb/HT201222