CarPlay disconnects during a phone call with iPhone 15 Pro Max

Alright, I have good news. Last night, I went through the process in this article: If you can't update or restore your iPhone or iPod touch - Apple Support. So far, this issue appears to be resolved for me. I'll detail the steps I took below:

It was an extremely frustrating process. I used a Windows PC with the Apple Devices application installed. The Apple Devices application leaves much to be desired. If you plan to attempt this, I would suggest trying it on a Mac if possible. When using a Mac, this whole process is completed using Finder. This way you might avoid some of the issues I'll mention below. Doing it on a Windows PC required a lot of patience and perseverance.

With the Apple Devices app running, I connected my iPhone 15 Pro Max to my Windows PC using Apple's usb-c cable. I changed the settings on the app to back the entire phone up to the computer and went through the back up process. If any of the settings aren't applying correctly or it's not taking your password to setup the encrypted backup, just unplug your phone and plug it back in. I opted for the encrypted backup option because it said that without it, it won't backup any sensitive info from the phone like passwords, etc.

Once the backup process was completed, I left my phone connected to the computer via usb-c and put the phone in recovery mode. To put the iPhone 15 Pro Max in recovery mode, press volume up, press volume down, then press and hold the power button until the screen displays a power cord and laptop on it (continue holding the button even after you see the apple displayed on the screen). It's the same process as a forced restart, but you continue to hold the power button until the restore screen is displayed.

Once the phone is in recovery mode and connected to the computer, a prompt will appear from the apple devices app saying that there is a problem with the phone and that it must be restored. Don't click update, click the option to restore the phone. This will erase everything on the phone, download a new iOS installation file and install it on the phone.

During the restore process, I ran into some issues. The first time, it failed about 30 seconds into the restore for error code 9. I put the phone back into recovery mode using the volume up, volume down, hold power method. After the prompt displayed again on the Apple Devices app, I went through the restore process again. This time, it made it more than halfway through the restore before returning error code (1109). 06B4.0000. Using tips from this post: Receiving an error code (1109) in the mid… - Apple Community, I changed the DNS settings on my PC to Google's DNS Server, put the phone back into recovery mode and attempted the restore process a third time. The third attempt at restore completed successfully. I don't know that the DNS settings change actually affected anything, it may have worked the third time without it. I just figured changing the DNS settings isn't really a big deal, so I did it.

After the iOS restore process, I used the backup I made when I first started this process to recover all of my data. You will have to answer a few prompts on the phone first like language preference, wifi network, etc. Finally, it will ask how you want to setup the new phone, I chose the option to restore from a backup on a connected computer. At this point, the Apple Devices app on PC should automatically display a menu where you can choose to restore the phone from a backup. You select the backup on this screen and start the process.

When restoring data from the backup, the app appeared to freeze the first time. I disconnected the phone, plugged it back in and attempted it again. The second time was successful. During the second attempt, the Apple Devices app actually recognized the iPhone as my iPhone's name instead of just generic iPhone. I think because of this, it allowed me to access the restore from backup option from a different screen and displayed a progress bar (it was actually a progress circle). The iPhone displayed a purple screen that said "restore in progress" during both attempts.

The whole process took me about 4 hours. I think it would've been less than half had I not had any issues with the Apple Devices app. This is why I would suggest using a Mac (on Mac, this process can be completed using Finder).

Finally, I connected my phone to carplay this morning and had a 25 minute phone call on my way into work. It did not disconnect at all.