USB Loader GX r1202
Did you install DIOS MIOS 2.2 wad for USB with Wad Manager 1.7 with IOS236 ?
And you try CFG Loader r48 and USB Loader GX r1202 ?(Replace the boot.dol in your SD or USB /apps/ usbloader_gx with the updated one.) I use r1202_IOS249 / boot.dol
Select loader mode: check GC Games
Loader Settings/ GameCube Mode/ MIOS (Default & Customs)
USB Loader GX, go into settings>custom paths, and change the path from SD to USB1:/games/;