Hi All, I am new to all jailbreak, blobls and downgrade. I have iphone 4 not jailbreak. I was using this phone fine and last week i got the ios update notification and upgraded to 6.1.3 now since then i am getting no service on my phone but 3g is working fine but sms and calls. I took it to apple store and after everything and all restore they also didnt fix the problem and in the end told me its a hardware failure and all they can do is to replace phone. I am out of warranty and they are asking me to pay £120. Now i am looking to downgrade my phone or even jailbreak also but reading everywhere that i need old shsh blob for earlier ios. Now can someone help how i can get these shsh blobs and downgrade my phone. Many thanks for help in advance.