Thanks for your reply. I actually have tried flashing my MY01 Z22se ECU with MY03 w/o EGR firmware( 09391273 Ver.8--->12586913 Ver.1). Untortunatley, it won't work. Firstly, the ECU's firmware version is tied to car's VIN (check here). It is not possible to have my MY01 to pull MY03 firmware out...