Hello, Iphone11proRebootLoop. Thank you for posting your question to the Apple Support Communities. We understand your situation and how you are noticing an issue when powering on your iPhone 11. It sounds like you have tried some extensive troubleshooting steps on your own already, and we’d be happy to help you continue from here.
We’re glad to see that you were already able to review the Apple Support article that explains which steps to try if you are noticing that your iPhone will not update or restore with iTunes.
To receive more help with your device, we would next suggest contacting Apple Support directly. Depending on your location, you may be able to contact Apple Support using the following link:
Get Support
We hope that this resource allows you to find more help with your iPhone 11. Please let us know if you have any other questions.
Cheers!