iPhone 17 Pro Max Cannot install iOS 26 Developer Beta Updates OTA or IPSW

I’m a registered iOS developer, and I’ve been facing an issue with installing iOS developer updates for the past couple of years. I can download the updates, but they get stuck at 99.9% complete and don’t finish. I’ve tried following the instructions to force restart the phone, but it stays on the Apple logo screen until it dies.

I’m able to update official iOS updates, but not the beta ones. To update, I have to put the phone in DFU mode and install the update that way. This is frustrating and causes issues with making timely updates to my app and diagnosing new issues during testing.

I’d like to request that Apple look into this issue and find a solution. For reference, I’ve installed a barebones installation with no new apps, and this problem persists. I would like to have a resolution that allows me to update normally without having to DFU the phone every time.

Struggling with this issue now and have not Yet found solution. Even after factory reset

iPhone 17 Pro Max Cannot install iOS 26 Developer Beta Updates OTA or IPSW
 
 
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