There is very little information online about the advantages of purchasing an ECU with the highest version alphabet - which means the most upgraded version.
My question is - what kind of benefits come to the purchaser? Are they noticeable? Or are they things you can never notice?
My original ECU is GY04-18-881E but am purchasing GY04-18-881R0H as its replacement
A good example of the issue at hand is 2001 - 2003 Toyota Rav 4 ECUs and the destruction of transmissions as a result.
Which was so bad that either the ECU had to be repaired or replaced correctly or the transmission would have to be replaced.
My vehicle is a Mazda MPV 2000 California Emissions with anti-theft model.
if you want to buy that ECU today you cannot find the original part number from Mazda only the updated version, hence i wanted to know what benefits could likely come from purchasing the latest version!
The truth is unless I go to a break yard, I can't even get the original part. I know ECU information is proprietary but in general terms and without breaking any laws or agreements - how do I benefit by purchasing the latest version?
Additional Edit: Here is an ECU change in which a newer version replaced the older version ECU replacing procedures