same error iOS 17.3 still

In apple site Xcode only Download on the App Store， I downloaded the installation package here https://xcodereleases.com

Thanks for your reply. YES, this error occurred when iPhone17Pro connecting to our Wi-Fi device. (WPA/WPA2 TKIP) The iPad Air M2, iPhone 15 Pro, as well as other older models of iPad and iPhone that I own, can all connect to this Wi-Fi. I changed the encryption method from tkip to aes, and now iPhone 17 can connect.

However, iPhone 17 does not support the devices that previous iPhones supported. I still hope you can fix the TKIP connection issue