DSM Chips is where you can find more info.
But real quick. EEProm is an Electrically Erasable Programmable Read-Only Memory. So some ECU have a chip, some dont. For these that dont have it theres not much you can do with them. The EEPROM suited ECUs have to be socketed first - that means that the chip needs to be undone from the circuit board and then a socket is soldered instead and the chip is pinned on the socket. After its socketed, the chip can be easily removed or flashing/erasing/ and burning/reprogramming/. You need an EEPROM reader/writer that is hooked up to a PC and the software that supports the EEPROM device. From there on you can change injector size, change fuel maps and so on. After you re done with the changes and burn the new values on the chip, but you always need to have your original settings on file in case shit happens.
Socketing and all that is a little outdated. Newer thing is the DSM link or the DS map, and the newest is directly connecting to the ECU and changing things as you go.
FYI some GS ECUs are EEPROM and I was told that it might be able to accept Evo 3 values, but this is not confirmed yet.
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