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The usbd.irx from Gran Turismo 4 is v1.4.0. This version does not work with uLE. The "external" $ony versions of usbd.irx that do work are the ones with version number below 0.17.0. These are from much older games than GT4.
Originally Posted by r0dent
As for exactly where/when (& why) uLE freezes when a certain non-compatible usbd.irx us used, I can't say (dlanor can probably) but it doesn't matter much since there's just no point in using such a driver.
We have not been able to see any difference or improvement in any way by using $ony usbd.irx 0.17.0 compared to the built-in default, so you may just as well ignore the whole thing. Use the uLE default and all will be well.