iOS: check firmware before Rebble

Author: ja-besse

howto.md

@@ -43,6 +43,7 @@ Note: you can skip this part if you're already a Pebble user. Instead, you shoul
 
 Part two: connect the Pebble app to Rebble Web Services.
 
+* On the phone, open the Pebble app, tap *Settings*, *Help* and *UPDATE YOUR PEBBLE*, to make sure your Pebble is at the latest firmware.
 * On the phone, open Safari, and go to [auth.rebble.io](https://auth.rebble.io/).
 * You are greeted with a number of ways to sign in. Choose one and sign in. **Remember your sign in credentials!** You will return to the Rebble site, and are greeted with *You're all set!* Read the page, then tap the *get started now* link in the first paragraph.
 * You are redirected to [boot.rebble.io](https://boot.rebble.io/), and are greeted with *Here we go!* Read the page, then tap the *switch to Rebble* button. Safari asks if you want to open it with Pebble. Tap *Open*.