Step 1:Download the appropriate firmware files for your iDevice fromhere. Also download Latest TinyUmbrella fromhere(used to bypass Apple's authentication servers and to kick your device out of recovery mode)
Step 2:Put your iDevice into DFU mode
Note:Your iPhone screen should be blank (black in color), if it is not, or if the Connect to iTunes screen comes up instead then you are most likely in Recovery Mode, not DFU mode. Please re-watch the video to ensure your device is in DFU mode.
Step 3:This step(and steps 4 and 5) are applicable to iPhone 4, iPhone 3GS, iPod touch 4G, iPod Touch 3G and iPod touch 2G (MC model) which have their SHSH files saved for the firmware you downgrading to.If you don’t have your SHSH files saved, you cannot downgrade the mentioned devices. We must trick iTunes into thinking it's validating the firmware file you downloaded from the Apple servers when in reality it will be verifying from your locally stored SHSH files that you backed up with Tiny Umbrella
Step 4:Open up Tiny Umbrella and click "Start Tiny TSS Server" (hopefully this will go off without a hitch, but if it says it can't open because Port 80 is blocked, close any applications that might be causing this i.e Skype).
Step 5:This step is optional, but if you want to verify that Tiny TSS Server is working you can ping gs.apple.com and it should return 127.0.0.1 as the result as seen below:
Step 6:Great we are almost done, now simply open iTunes and plug your device in. Shift click (or option click) on 'Restore' (Not update!) and select the firmware file we downloaded earlier.
Step 7:Now let iTunes do it's thing. Somewhere along the line iTunes will pack a sad and give you an 'Unknown error'. Don't worry about this, your firmware file has already been loaded. This error (error 1004) is just a baseband error.
Step 8:Open the latest version version of TinyUmbrella which you downloaded earlier. Click 'Kick Device Out of Recovery'.
There you go, you have successfully downgraded your iDevice firmware using SHSH files.
Please remember, if you have not saved SHSH for previous firmwares you can not downgrade but guess what, what better time than now to save SHSH files for the current firmware.
NB: Sudah saya coba sendiri dan berhasil,,Jika ada pertanyaan silahkan koment,,mungkin Kami bisa Bantu