How can I reenable developer options after updating iOS?

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An iOS bug may cause the developer options to disappear after updating iOS versions, this has been observed when switching to iOS 8.x. These options can be reenabled with the following steps:

  1. Connect the iOS device to your Mac development machine.
  2. Start Xcode.
  3. Open Window > Devices & select your device.
  4. Wait for Xcode to finish copying symbols and then check the device's for the Developer settings.
  5. Reboot the device.

Xamarin Workbook

If it's not already installed, install the Xamarin Workbooks app first. The workbook file should download automatically, but if it doesn't, just click to start the workbook download manually.