hihi, we again differ in version. The files i linked would be 1.3 nad thus
flasher-3.5 -k rescueOS_n900_kernel_1.3.zImage -n rescueOS-1.3.img -l -b"rootdelay root=/dev/ram0"


ica, really no problem.
you are doing two major things right already.
1. you are not running away when it becomes complicated.
2. you learn to describe your problems/issues and formulated questions from that.

One day your questions will be so precise, you will find matching answers for them only by hacking the question into a search engine.
Until then, we are happy to point you to the root of your vaguely described issues.