How to update my iPhone 6s to IOS 15
Hello,
do you guys know my 16 GB 6s phone has already occupied with 6.5 GB with system store memory with iOS 14 version. Now please help me to update iOS 15 version erasing all memory and from beginning as it want 3.5 gb you can delete all updates and update freshly iOS 15 so my phone system memory will be only 3.5 GB ? Is it possible?
iPhone 6s, iOS 14