Signed iOS 15 for iPhone 11

S3bash wrote:

Hi, I’m trying to find a signed version of iOS 15 or 16 for my iPhone 11, because since I installed iOS 17

a few weeks ago, my phone is messing with it’s battery, and it’s performance, so I don’t know if anyone has a link with that version signed, I really need it

No going backwards...

unless you have some archived backup saved..

Restore from backup, restore as new device.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

put your iPhone in diagnostics mode - identify potential hardware and software issues

How to put your iPhone in diagnostics mode - Apple Support

Note: The current stable release of iOS including bug fixes, is iOS 17.5.1

Update your iPhone or iPad - Apple Support

If your iPhone or iPad won't update

If your iPhone or iPad won't update - Apple Support

Apple does not support iOS downgrades.

Updates are a one way street, and you can't go backwards.