How can I root or make my partitions mounted rw? I can edit firmware, how can I make my firmware rooted?
I tried changing all ro in init.rc to rw, but after boot they are mounted in ro. I guess the problem is there. Also I can't remount in adb. It says no errors but doesn't do the job. So all one-click root apps can't root, because they can't remount. How can I root or make partitions rw?
Thanks
Usually a bug is exploited to temporarily get a chosen process running as root, that is used to remount the file system read write, either startup scripts are changed and/or suid binaries added, then the file systems are synced and remounted read only again and likely the device is rebooted.

You don't normally want to have the system partition writable on an android device, even when rooted - you only make it writable on the rare occasions when you are changing it.

EDIT-Summary of comments: It appears that /system on this device is cramfs, an inherently read-only compressed file system.  Likely a modified image would need to be generated on a PC and then flashed.  

Search result for dealing with this problem on rockchip based devices:

http://www.androidtablets.net/forum/rockchip-based/439-how-unpack-repack-custom-firmwares-rockchip-rk28xx.html