Erase SPI Flash Images on Rock pi 4B

Hi guys, how are you? I’m trying to erase the Images on SPI Flash on my Rock Pi 4B in order to boot, I followed this guide
Windows section but the SPI doesn’t erase.

I’m booting shorting the pins 23 and 25, but the devs told me that I must erase SPI Flash Images, but I can’t do it or I don’t know do it, something Is missing.

Can you help me out please?