iPhone stuck at Waiting for Iphone

[mark.iphone3gs]

Hello Friends please help me
I have a Iphone 3gs (which is bricked i guess).
Here is what i did:
I used Sn0wbreeze 2.9.7 to prepare custom ipsw (from 4.3.3) and it got pawndDFU (by iREB i guess). Then I started Tiny umbrella. An opened Itunes to upgrade under recovery mode (Custom Ipsw). Everything was going on fine but now Iphone is not starting.

NOW
Whenever i am trying to upgrade my phone using itunes ( Not the custom ipsw)
it gets stuck on waiting for Iphone and it is stuck there for ever.

-I have removed (gs.apple.com )extra line from hosts
-I tried to boot it using redSn0w but is doesnt work

 

[mark.iphone3gs]

Sombody please help

Will going to iphone service center help?

 

[Siggen]

try a different USB port (all of them)
try different computers

 

[TriJetHero]

Use redsn0w less prone to problems

 

[mark.iphone3gs]

I have found the original updater log

I was going through the update log of the day this all problem started

log has these lines

2013-01-28 16:19:07.956 [7456:3f78]: device returned AMR error 37

and then
.
.
.
.
entering update_device_firmware
entering update_iBoot
write_image3_data: flashing LLB data (length = 0xf984)
0: RamrodErrorDomain/3e9: update_iBoot: error writing LLB image
1: NSMachErrorDomain/e00002e2: write_image3_data: AppleImage3NORAccess returned an error when writing image3 object

finally
2013-01-28 16:19:08.127 [7456:3f78]: <Restore Device 07A71220>: Restore failed (result = 37)
2013-01-28 16:19:08.273 [7456:50fc]: iTunes: Restore error 37

what does it mean , I am unable to upload the entire log file, if some one is will to help me I can mail it.

Thanks in advance