Originally Posted by Strephon Alkhalikoi
Update your kernel as it apparently doesn't support zRAM. The U30 kernel is available here
and includes zRAM support.
Thank You Strephon,
I will look into it. the boot_cm.img will be updated via flash (what is the flash command to flash boot_cm.img?)
And how to flash modules.zip and flashable_CM.zip? (via recovery?)
And if it was not working, can I go back to previous boot.img by restoring nandroid backup?
EDIT: Solved, Thank you Strephon.