wow. this worked perfectly. can not believe some obscure list of directions would fix the flashlight on an iphone 5. so this is definitely a software issue. Am running the latest ios9 version on the iphone 5.
Same problem here. Greyed out flashlight from the control center. This is what I did to fix it:
1. Close all apps
2. Lock the phone (screen off --- on-off button in upper right top of iphone)
3. Press the lock/unlock button (on-off button in upper right top of iphone); and then from the locked screen open control center (slide up from the bottom); and launch the timer app.
4. Lock the phone
5. Press the lock/unlock button and from the locked screen open control center and push the play icon. This needs to play a song from your playlist.
6. Lock the phone
7. Press the lock/unlock button and from the locked screen slide the camera icon up from the bottom right hand corner to the launch the camera app. Do not take any photos, just count about 5 seconds and then press the home button to exit.
8. Now slide the control center up, the flashlight should now work.
******** spoke too soon. now stopped working a few moments later. mayb need to do this in combination with the note in my next posting.