Dear @Manoj ,
i have 2 devices dubai (Edge 30). One stoped working after update 3.2 to 3.3 and needed a new install. Then update from 3.3 to 3.4 was fine.
The other i tried to update directly from 3.2 to 3.4, but hanged during log in as the other previously. Again a new install and now both are on 3.4.
Thanks