CYDIA MISSING FROM 3GS! iOS 5.1.1 (jailbroken)

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May 23, 2012
I am using iPhone 3GS with iOS 5.1.1 (jailbroken, used Absinthe 2.0)
I recently noticed that I have no Cydia installed (or maybe missing) in my phone. It was there when I did the jailbreak, but it's missing now! How to get it back?
I have searched and tried hundreds of posts and threads regarding this, but still no luck! :(
How can I get Cydia back?

1. I can't restore it to original 5.1.1 via iTunes. Gives me an error.
2. I have saved my SHSH blobs through TinyUmbrella. But I am not sure about the number of files. TU says "IT IS TOO LATE", but I have some files saved in my computer. I am attaching a preview of the files.
3. Can't install the deb file of cydia manually by any explorer app like iFile, iFileExpress. Through iFunbox, I have successfuly copied the deb file into some root folder. I can even view that file in iFile, but can't install it. It acts as if it doesn't support the file ! :(

Please do reply! I want Cydia back! :(