"not reading use" ? I guess you want to write "USB" ?
if USBLoaderGX cannot read your USB :
1. you plugged it into the wrong USB Port !
2. you are using FLASH instead of HDD ! (NO, don't use flash drives at all with Wii or WiiU. Even Nintendo tells you they are NOT compatible)
3. don't use another Wii, the problem is not the console, it's you. You didn't softmod correctly, you didn't follow proper guide, you didn't setup the homebrew correctly, etc.
you need to provide more information if you want more help.