Langkah Langkah DOwngrade Iphone 4 3GS 41. ke 4.0.1 adalah sebagai berikut
Step 1
Step 2
* Run TinyUmbrella
***READ THE README TinyUmbrella README NOW Yes. You Read it.
# Hit the Start TSS Server button

Step 3
# Now open the iTunes. Hold down the SHIFT (Windows) or Alt/Option (Mac) key and hit the Restore button on iTunes.
# Then browse and select your downloaded iOS 4.1 FIRMWARE

Step 4
Let iTunes error with 1004 error (baseband update failed “ we want this

No simply hit the Kick Device Out of Recovery button on TinyUmbrella.

done ..
