Why am I unable to jaibreak and unlock my iPhone 4?

I

iMore Question

I have recently changed the motherboard of my iphone 4 and now it apperas to be left on activation screen since the motherboard is AT&T so locked in US.
I have stored the ios 7.1.2 and now i cannot jailbreak due to Pangu requirment for specific date on the iphone when jailbreaking.
I cant downgrade either because tinyumbrella doesnt work on my laptop.

Please help
 

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