Error and warnigs in devices and simulators Issue :
Details
Failed _shouldMakeReadyForDevelopment check even though device is not locked b
I started getting the OP's error after updating my iPhone to iOS 13.5.1. Here is what worked for me to resolve the issue:
The "NEW" steps are not steps I've seen in previous answers, so I posted this answer.
I finally figure it out
check this photos
I tried all the solutions on this post and nothing was working until I saw the answer by @weatherangel.
I was connecting my iPhone 8 via a USB to a hub which connected to my mac.
My mac doesn't have USB ports so I ordered a USB-C lightning cable and connected my phone directly to my mac and now it works.
The caveat is that I still see this error but the build is working and I'm seeing my local changes. So this error seems to be a bit of a red herring.
I had some success turning Bluetooth off and on again on the phone. Still, the watch often disappears.
None of the above worked for me. With iOS 14.0.1 and XCode 12.0.1. I suspected it is an Apple bug with wireless communication to-from the device. Since my iPhone can be used as a hot spot for my Mac, I found that once I used my iPhone as a hotspot from my Mac, XCode was able to upload the App binary to my iPhone and debug.
So I'd say if nothing else works then try to use your iPhone as a hotspot for your Mac, and then you should be able to wirelessly debug.
Mine got resolved when I updated the Xcode from 12.2 to 12.3 Beta.
My iPadOS version is 14.2.
Even though XCode 12.2 supports OS 14.2, I faced the same issue. It is the XCode bug.