Hello everyone. I recently acquired a PS2 slim v90000 (NTSC/J) and I was thinking about installing a modchip. I have never done it before, but I think that being able to solder, I can roughly manage to install the modchip by myself.

After googling a bit, I found out that many chips work on this version (GH-070-42), being the most famous Modbo* (a MI clone). I would like to ask you some questions, because I feel a little bit confused after gathering all the information I have found here and there:

1-What exactly is the difference between Modbo 745, 750, 760 and 4.0? I mean in terms of game compatibility, region unlocking, installation difficulty, and design "quality"? What version is considered the most "up-to-date" and what would you advise me to buy?

2-After seeing a Modbo 750 installed on a GH-070-42 and checking the wire connections, I feel very confused why most sites point out this diagram as the correct one. I found out another diagram on the web, which matches the picture of the Modbo 750 installed on a PS2 90000 as mentioned before, so I think this is the correct one. Am I right in this assumption? Could you point me out the correct diagram for the modchip you advised me to buy on the previous question?

3-Do I need to take any special care when installing the modchip? For instance, it appears that only in v12 you need to fix the dvd laser. I was crawling this forum and I found out several people who said they installed some Modbo on a 9000x and that after 10 or 15 minutes the ps2 broke or stopped working properly. Then they were told to do the "resistor" and "PNP transistor" fixes. What kind of fixes are these and how can I accomplish them? Are they really needed or highly recommended for 90000 or not important at all? Are there any other "special" fixes for a "perfect" installation of a Modbo* on a 90000?

4-There are plenty of shops on the web selling Modbo*'s with lots of duplicated information. Many say you can't upgrade the firmware, others say that "now you can upgrade it" and others say both (somehow it seems like the information was copy pasted from various sources...). So, what does firmware updating success depend on? Does it depend on the chip's date of manufacture, or can I safely buy a given Modbo* chip and update it to the most recent MI firmware version (1.93)?

5-What stores on the internet do you advise me to buy the chip? I mean of trust and professional delivery.

Thanks very much everyone for the insight you provide me.

I wish you all a Happy New Year