you can't!
Access is a company that Blitz outsourced their ECU's to. Access is a company STRICTLY in Japan and UK and tunes ECU's according to customers spefications. Blitz will have no record of what your ECU was tuned for. The only way to find out directly what you're ECU is tuned for is to find the Access tuner in Japan and contact them to see what they have done with the ECU.
You can take it to another ECU tuner, good luck finding one...., and they might be able to tell you what Access has tuned your ECU for.
In general, there is a speed cut, boost is raised, fuel cut is eliminated, and depending on the specifications, injectors may or may not be required. A member on SF did report a Drastic increase in throttle response and they got an extra 20rwhp just by switching to access.
Good luck and let us know if you're able to find some one tha twill tell you what the ecu is made for.
Bryan