Thunderbolt problem with Early 2011 macbook pro after replacement logic board

My macbook pro 17" 2011 early GPU broken in last month.

and Apple replacement a new logic board for me.

but thunderbolt can`t read thunderbolt external HDD(seagate back up plus 1T with thunderbolt). (thunderbolt to hdmi and thunderbolt to firewire 800 are work well.)

so I take macbook pro back to apple changed logic board twice.

but still same problem.

Apple engineer told me cause new logic board changed new AMD GPU chipset.

so I have to wait new thunderbolt firmware update release....(I bought apple care and limit till AUG)

is it true?It doesn`t make sense.because thunderbolt work well before I changed logic board.

Does anyone know how to fix this problem.Thanks.

sorry my english very poor><

MacBookPro, OS X Mavericks (10.9.2), macbook pro 17" 2011 early
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solved by myself ^^

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