You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.
= $os ?> = $version ?> Release Notes
It should be noted that these are the official release notes for the = $os ?> = $version ?> from Apple
iOS 13.3 includes improvements, bug fixes and additional parental controls for Screen Time.
Screen Time
- New parental controls provide more communication limits over who their children can call, FaceTime, or Message
- Contact list for children lets parents manage the contacts that appear on their children’s devices
Apple News
- New layout for Apple News+ stories from The Wall Street Journal and other leading newspapers
- Easily like or dislike stories with a tap
Stocks
- Stories from Apple News are now available in Canada in English and French
- Continue reading with links to related stories or more stories from the same publication
- “Breaking” and “Developing” labels for Top Stories
This update also includes bug fixes and other improvements. This update:
- Enables the creation of a new video clip when trimming a video in Photos
- Adds support for NFC, USB, and Lightning FIDO2-compliant security keys in Safari
- Fixes issues in Mail that may prevent downloading new messages
- Addresses an issue that prevented deleting messages in Gmail accounts
- Resolves issues that could cause incorrect characters to display in messages and duplication of sent messages in Exchange accounts
- Fixes an issue where the cursor may not move after long pressing on the space bar
- Addresses an issue that may cause screenshots to appear blurry when sent via Messages
- Resolves an issue where cropping or using Markup on screenshots may not save to Photos
- Fixes an issue where Voice Memos recordings may not be able to be shared with other audio apps
- Addresses an issue where the missed call badge on the Phone app may not clear
- Resolves an issue where the Cellular Data setting may incorrectly show as off
- Fixes an issue that prevented turning off Dark Mode when Smart Invert was enabled
- Addresses an issue where some wireless chargers may charge more slowly than expected
For information on the security content of Apple software updates, please visit this website:
https://support.apple.com/kb/HT201222