Este es el nombre: ti92_21.rom
Y hago esto:
2. INSTALLATION
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Unzip the zip file, and copy the content of the directory fw1.5
on the psp/game directory (or psp/game150 for custom firmware).
Get the rom file of your TI92 and save it as
psp/game/__SCE__pspxti/ti92.rom for 1.5 FW,
or psp/game150/__SCE__pspxti/ti92.rom for custom firmware 3.x-OE.
Gracias, un saludo