There is a minor error in the Pin Definition table on https://openwrt.org/toh/hilink/hlk-rm04, probably a copy / paste typo.
Pin 6 is USBP, but in the explanation column it says: USB signal D-. This should be USB signal D+.
Likewise, pin 7 is USBM, but in the explanation column it says: USB signal D+. This should be USB signal D-.
Minor issue that nevertheless could cause confusion. I don't have write access to this page to correct it. Who has?