Sur le site de la team matrix :

HOMEBREW FIRMWARE:

INFINITY Homebrew Firmware - 17/01/2005(DOWNLOAD NOW)
Release of latest Homebrew Firmware.

This Firmware will bring back the Infinity to Homebrew mode, and remove the possibility to use back-up in your PS2.
To upgrade again the Infinity from Homebrew to regular Firmware you need to upgrade it again using these instructions.

T'as juste à suivre les instructions donné par le lien ci au dessus pour repasser ton firmware en infinity firmware.

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