OK, I know that I'm bad at explaining things to others, that's why I don't want to be a teacher, but I think what I said was understandable.
So: You need a NAND file from someone who has pdaXrom (these would include all personal informations on his Z, etc) because you can't get into the flashing menu (with Power+OK).
I said that you don't need this.
Because: If your Zaurus is so bricked that you can't get into the flash menu, then a NAND restore from the stock NAND files will help and you can get there. A pdaXrom NAND file would also help, but it seems that you don't get that from anyone, but you can download the stock ones.
And if you restored from the stock NAND files, then you get a working flashing menu and can reflash to pdaXrom in the ususal way.