Flash dhivael's SPI uboot (risky)

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Now I have a problem that I cannot go to maskrom neither loader mode. When I connnect the cable I do not see any device in rkdeveloptool. No matter if PBP is on or off or whether I press the recovery button on PCB prior connecting the cable.

As far as I am aware, maskrom mode will not happen unless there are no bootable devices available. if you have everything else unplugged, the only possible bootable culprit would be your SPI. If your SPI is corrupted, you will need to bypass it by shorting ground to clock. I think that will be the only way you can get into maskrom at this point. good luck!