Can’t download iOS 15.0.1
I have iOS 14.8 on my phone and i can’t even download iOS 15. I know this is not a storage issue, because i have like 80-90 GB of free storage.
iPhone SE, iOS 14
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To perform an update procedure wirelessly, you need to connect your device to a reliable and fast Wifi Network with internet access (no cellular data, unless you use a 5G network, no personal hotspot on your device, no VPN connections, no low power mode are admitted). AND I suggest that you keep the device plugged into power during the whole update process.
Do not forget to create a full backup of your device, before any updates.
That said, assuming you're trying to update your device wirelessly (via wifi), see this suppport article:--> If your iPhone, iPad or iPod touch won’t update
If the issue persists, try to update it via computer:
Learn how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier or a Windows PC.
If you still get no help, contact Apple Support directly, using this link:--> Get Support
Regards
Giulio