I want update my iPhone to 15.7.7
I want to update my iPhone 15.7.7 so that I may be able to download WhatsApp.
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Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.