I have 2 ps2 models I have tried this on SCPH-30001 and 50001
With the network adapter and hard drive removed I can boot the CB9.3.elf no problem, choose cheat, and hdl launches. Of course it cannot find the hard drive.
But with na and hard drive installed and I boot the .elf I get a blank screen. HD is working because I can launch hdl by itself and game list is there.
if I left out any info let me know