Although you could try out an app I use (and love) called LED me know.
It's free and allows for lots of different customizations for alerts. It even lets you set the LED colour per each notification.
One note, if you set up and custom settings in the app you need to turn off the default phone settings for the corresponding notification or you will get duplicate notifications. Personally, I only use it for LEDs, but it can be used for vibration, sound, etc.
If LED me know doesn't work then I would say a factory reset is your only option to have an LED flash for missed calls.
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