Recovering from BRICK iPhone with iOS 9

In a flush of recklessness, I decided to upgrade my iPhone 5s (7.x) in order to try to resolve some of the iTunes <-> Music update issues I was having (missing and duplicated songs).

Knowing that 8.4.1 has been around and working for a while, I went ahead. Little did I know that 9 was just released. Long story short: all goes well until "Slide to upgrade" then death. No amount of messing around helped.

Fix was to follow Hardeep Singh's advice here. Remember to press Option key

Thanks, Hardeep!

OS X Mavericks loss of (Bluetooth) mouse after update

Delete /Library/Preferences/com.apple.Bluetooth.plist. That's it.

Got the tip from here.