CCcam read only file system error

Morning lads,
I am trying to downgrade my cccam 221 to cccam 214 in my DM500s with darkstar II image installed.
CCcam 221 cannot be uninstalled so I used killall CCcam command in /bin folder
When rm CCcam_221 from telnet a ''read only file system'' error is shown and file is not deleted.
In Filezilla when trying to delete CCCam bin file nothing happens and I cannot overwrite it with the ver 214 bin file.
This method worked in the past so not sure what is going on now,any ideas ?
cheers clanser

In the uninstall menu nothing shows,in the emu menu shows only 1 cam installed ie CCcam2.2.1 ,no CI for some reason.
tried DCC with the same result as filezilla,
Have found an image with CCcam 2.1.4 installed and will try it tomorrow.
cheers