
Unable to downgrade, there will be a message
Red color NOT Signed.Click on the update you want to downgrade to download the file with the extension
.ipsw.
Download the software
Launch iTunesand connect your iPhone to the computer via a cable.
Once the connection is established, select
This Computer > Back Up Nowto back up your iPhone data.

On your iPhone, go to the
Settings > Searchsection. Enter inside to disable the feature
Find My iPhone, please!

Then inside the iTunes software,
hold down Shifton the keyboard and select Restore iPhone.
Next, choose the file with the extension
.ipswthat you just downloaded in step 1.

Click on
Restoreto initiate the downgrade process on your iPhone!

Perform a query using the address
AppData > Roaming > Apple Computer > MobileSync > Backup >Select the backup you just performed at step 2.

Open the
Infosection with
Open Notepadand locate the Product Name section, below which there's information about the update, you
change it from 16 to 15.6.1and you're good to go. Then,
save the Notepad fileand exit out.

Once the downgrade process is successful, click on the option
Restore from this backup > Continueand you're done. Your data will be restored without any loss.

Conclusion
Above is the article sharing about how to downgrade from iOS 16 to iOS 15 for those who intend to downgrade iOS extremely simple and easy to do. Hopefully, this article will help you downgrade iOS quickly and successfully.
- Explore more: iOS Tricks