Thanks for information. I run into another issue. I tried installing rockbox on PC. After connecting iPod to computer, it stated media needs format before using. So I format drive as FAT32 and installing rockbox without success. Then, I restored iPod on macOS. Now every time I connect iPod to Mac, I get error “do not disconnect” with red circle and cross bar. I can still sync and transfer music file to iPod. After syncing I click eject iPod, the error goes away. How do i fix error and try install rockbox again, thanks for helping out.