Hi Everyone I'm don't have much knowledge about JBing. I tried upgrading my jailbroken IPhone 4 to 5.1.1 using redsn0w custom ipsw. But unfortunately ended up in recovery mode :-( The phone is detected in recovery mode by iTunes, when i try to install custom made no BB ipsw it shows up error 1604. I tried making an another ipsw by stitching my blobs to the custom ipsw and tried installing but receive the same error still. I tried on different computers, USBs, iRec, redsn0w etc but i couldn't get the phone out of recovery mode. Pls help me!!!