upgrade of jelly bean to ice cream sandwich

Solution
Android L is still in Beta. It still isnt released for public. The android L is a developer edition for developers to work on it. Probably android L would be released in the coming months and if it is available for your phone you can upgrade it then.
Hope this helps.
Just a quick note, doesn't look like English is your primary language, but to be clear, you want to upgrade to Ice Cream Sandwich from Jelly Bean?

If you went from Jelly Bean to ICS, you would be DOWNGRADING. Jelly Bean is a newer version compared to ICS.

Here's the order:
Android alpha (1.0)
Android beta (1.1)
Cupcake (1.5)
Doughnut (1.6)
Eclair (2.0–2.1)
Froyo (2.2–2.2.3)
Gingerbread (2.3–2.3.7)
Honeycomb (3.0–3.2.6)
Ice Cream Sandwich (4.0–4.0.4)
Jelly Bean (4.1–4.3.1) <- you are here in the OS hierarchy.
KitKat (4.4–4.4.4)
 


And android L which is in beta
 
Android L is still in Beta. It still isnt released for public. The android L is a developer edition for developers to work on it. Probably android L would be released in the coming months and if it is available for your phone you can upgrade it then.
Hope this helps.
 
Solution