Comment 4 for bug 1439864

I updated from r19 to r21 directly as prompted. The upgrade went without any problem and the phone restarted normally. Later I restarted it manually in order to insert a new sim card and it went in a boot loop for several seconds. I got the blank screen with the bq logo 4 times before loading and seeing the ubuntu logo. Then I changed the language (from French to English UK) and the boot loop went for several minutes. I waited at least 5 minutes with the same repeating bq logo before getting the phone to load. Fortunately I didn't need to do the system reset.