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steve99 was able to flash a friend's auto 15' FRS with Stg. 1 93 pumpgas ROM.
I let Ecuflash correct the checksum.
The Ecu did not want to accept the key (like it was an Ecutek/BRZEdite, etc. locked ECU but it was not, he bought the car brand new fresh from the lot), until it finally accepted it and successfully flashed the ROM.
I can't thank you enough for this post. It helped tremendously!!
He has a D00D ROM.