Not able to update 15.2.1
Im bot able to update 15.2.1 as updates are available but options are not their of download and install
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Try to update via your computer, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
https://support.apple.com/en-gb/guide/itunes/itns3235/windows
If you have a Mac, see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
https://support.apple.com/en-us/HT212185