There was a good method to get to here, that disappeared somewhere around iPhone 5 iOS era. It appears that the common method, that never worked with iOS indeed now does. Many thanks to EvilKittyCupcake for this, over at iMore. And tapping the dB numbers switches back and forth to the dots. If you just enter the number sequence without the power button, you get a temporary screen that gives this. Sent from my iPad using Tapatalk
@budney. Agreed. I had it working up through 5S I think, then the method changed. This procedure may have been around for a while for iOS ( at least other comments suggest that),but I was unaware. This number sequence goes back to the old Nokia or Moto standards. Sent from my iPhone using Tapatalk
I did this under iOS 8.x a couple of weeks ago. Just updated to iOS 9....and it was grandfathered in. So it's working for me. That is the dB numbers are there and I can tap back to the 5 dots. What was your situation? Sent from my iPad using Tapatalk
I put my phone in dfu mode to flash it. I prefer to have my phones flashed, not upgraded. Good to here dBm survives the upgrade process. Sent from my iPhone using Tapatalk
So you did the upgrade to iOS 9 via the DFU (device firmware upgrade) method ( instead of the OTA firmware upgrade), and after that, the OP technique didn't work for you? Sent from my iPad using Tapatalk
Correct! Update: I just tried again and it worked! I must have entered the number wrong. Sent from my iPhone using Tapatalk