Urgent: need help SPI flash via usb otg

I have compiled rkdeveloptool on mac os catalina with all bootable media removed, I plugged in USB to my macbook and the other end to USB OTG of rockpi 4b, but it doesnt seem to detect the device.

$ rkdeveloptool ld
not found any devices!


I followed this instruction to clear SPI flash by connecting pin 23 and 25 , then took out the wire, now green led stays on permanently, tried flashing to spi using macbook and raspberry pi zero but I get same result. not found any device ! Just tell me is my rockpi dead ?
what can I do to fix it ?