How do I install a new software without the previous software being downloaded?

[AC Question]

How to install new software without previous software

Hi

I am trying to install new android version on my Samsung galaxy S2 gt-I9100. Unfortunately during installation the current version is deleted but new version is not install. Now what can i do next, because i did not have now access to his memory any more, any idea what i do next to install my android back to my mobile. Thanks