PS1/2 new ps2 slim model GH-052-02

[Nocturno]

Hello, I just bought a new ps2 slim and a crystal chip 2.0
I thought v15 was the last model, but I don´t know what model my ps2 is, I found diagrams for cristal chip and they say the latest models are:
PS2 77001 v15a GH-051-02
PS2 77001 v15b GH-051-51

I found my model is
PS2 77001 GH-052-02, the mb is similar to v15a but not the same, now I don´t know how to install the mod chip..

can anyone help me?