iPhone 12 shows up then disappears on itunes

Bustermis1 Said:

"iPhone 12 shows up then disappears on iTunes: I’ve tried all of that. It would show up and let me trust the device then it would disconnect within 30 seconds. The cord works with my 6s no problem. Now when I plug my 12 pro in the prompt for trusting the computer comes up, but now doesn’t on the phone even after resetting phone. So when it does connect it still disconnects within 1 min"

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A Few Thoughts:

• Reset the SMC and your NVRAM:

Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for Ports) become manipulated, technically. So, reset the SMC and NVRAM. Use a different external keyboard, if an available option. It may take up to 3 time to successfully perform the reset, so be certain you have the time to perform that.

• Creating a New Administrator User:

See what happens when you perform this in a new user. If it is successful, then it is something misconfigured in your current user.

• Try while Booted into Safe Mode:

Try nothing into Safe Mode [Hold Down: shift key upon boo]. While in safe mode, caches (loading items) are fixed, and login items do not open upon login.

Hello Bustermis1,

Thanks for that info and for choosing the Apple Support Communities. If we understand correctly, you are unable to restore a backup to your new iPhone with your Mac. To help with this, please see if the steps in this Apple resource helps with your situation:

If your computer doesn't recognize your iPhone, iPad, or iPod

Cheers!

Thanks for replying, Bustermis1, and that additional info, it really helps! Since you are still having this issue, please see the "Get help" section of this Apple resource and then contact Apple directly if you need any further assistance.

About the 'Trust This Computer' alert on your iPhone, iPad, or iPod touch

Get Support 

Have a great day and thanks for using the Apple Support Communities!

I'm Also facing same issue using iPhone 12 on MBP 2010 with Mac OS X 10.13. but was able to manage to restore my data but not completely. I would have tried 50+ and tried to DFU mode to update and restore backup, iPhone got struck in DFC and got it resolved. However still facing issue on iPhone detecting on Itunes. Need solutions to fix.

Addition to add: When i connect iPhone to Itunes i don't get the trust this computer option. But if do get i don't get a chance to punch in passcode or allow on trusting this computer.