iPhone 3GS unlock phone then did update and it became lock and dead
I have unlock iphone 3gs (unlocked with the help of jailbreak) then i updated it to new version of iphone 4.3.2 and it became lock phone again so I try to restore older version and it became dead.
So now what should I do
Apple will not let an iPhone be restored to a previous firmware, that is the first problem. A second problem which I believe you do not have yet, how was your iPhone Unlocked? If Unlocked with iPad Baseband then you can only restore with a special Custom Firmware, never with a Stock Apple Firmware. But since you say you updated to new 4.3.2 firmware and just encountered a Locked iPhone, I believe you do not have the iPad Baseband. So back to the first problem of, Apple will not let an iPhone be restored to a previous firmware....to do this you need the SHSH code for the old firmware. If you have this SHSH code you can restore to an old firmware. To be honest not knowing your whole story, you are screwed. If you want to Unlock your iPhone now you may have to use the very bad iPad Baseband, which will disable your GPS Chip, and not allow you to Restore with Stock Apple Firmware, you will always need to use a Custom Made Firmware. So tell us what you want? An iPhone that turns on. Or an iPhone that turns on and is unlocked? Do you have your SHSH codes?
To fix this you have to unlock your Iphone 3GS permanently. So that your mobile won't get locked if you upgrade or update your versions. There are many methods available to get your Iphone 3GS unlocked permanently. Among those i would suggest the site Mobile-Unlocker.com ,and unlock it using step by step unlocking instructions which is given in the site itself.