QUOTE(linkokkeen @ Sep 26 2011, 05:19 PM)
Hi sifu, thanks for the advice, can u teach me how to do tthe shsh blob ah?
is it me must upgrade my 4.1 to 4.3.3 then only can make this shsh ah?
Where can i find the TinyUmbrella ah?
thanks
damn my iphone4 corrupted

SHSH blobs are assigned by Apple only. Older version are not signed anymore, only the latest iOS blobs, which is 5.0.1 now.
Means, if u have never upgraded to the previous iOS before, u're not able to retrieve it back. Blobs are not able to be shared as it was unique for every iDevices.
Even if you have upgraded to the previous iOS before, revertion could only be made IF you have the blobs saved, which is do-able via JB + tinyumbrella software. Cydia have auto save the blobs for u if you have JB before.