Hey sorry to hear of the issue. Have you tried contacting a US based tuner ,IE Vince @RT , Rob @ Kaizen or The guys at Realdeal? I would start there maybe your reading the ECU wrong? I thought the ROM number is what was the key. When I was SC I was tuned fine, When I went back NA I had to have the ECU updated and my ROM changed and I had to send UPREV my "new" ROM. What year is the Z?
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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