As far as I now (I don't use modchip) the last firmware version for Matrix Infinity was 1.93
I've been reading a little and it looks like you should look for 3 apps:
November 24, 2006
Firmware V1.93 Released.
Released today V1.93 Firmware for the Infinity Modchip.
New Features and additions:
- Taiwanese V14+ fix
- Firmware 1.93 - 244Kbps
- Dev2Install v1.1 - 152Kbps
- Infinity Manager v1.36 - 140Kbps
I hope it was helpful. The official webpage is closed, but Google is a friend
PlayStation 2 [SCPH-30004 R, v5] + Network Adaptor (80GB HDD)
PlayStation 2 [SCPH-70004, probably v13] + modchip (probably MatrixInfinity 1.4 clone)
-- FreeMcBoot 1.8b, uLE 4.42d, OPL 0.9.1, SMS 2.9r4 --
PSP 2004: TA-085v2 (semi-bricked)