Dat is mooi k#t.
Your problem is the so called "other storage", it's a common problem under the pre Amber.
And it has nothing to do with the price of your phony, they are all the same.
Ok? here's what you can do.
For the storage, install the Beta version of ................................Lumia Storage Check beta.
Lumia storage check beta | Windows Phone Apps & games Store (Nederland)
With that proggy you can also install the HereMaps on your Sd card.
luckily his phone is running gdr3+black out of the box
And use Lumia System Updater for the updates.
After you pushed and installed all of the updates ( manualy ) then go to Settings/phoneupdates and check again.
Also you can register your Phone as a developerphone and force Gdr 3.
There fore you need the app "Preview for Developers".
And you have to register at ...............
Ahwell you can better read it yourself than i can explain it ;-)
Get a developer license (Windows Store apps) (Windows)