Always use a stabilized 12V-14V power supply. Voltage drops during writing can result in a dead ECU.
Use an anti-static mat when opening the ECU case to avoid damaging the CMOS components. me7.4.5 pinout
Typically a 95320 chip. This stores the Immobilizer (Immo) data and coding. Microprocessor: ST10F275. Always use a stabilized 12V-14V power supply