If you want to remove the openmode warning, you need to flash it clean to cosed mode first;
sudo flasher -F firmware.bin -F emmc.bin -f -R
Then remove the warning:
disclaimer-cal remove View-openmode
And last, do the back-to-back flashing.

The back-to-back flashing procedure is to make sure that when the device boots up the first time after a clean flash, it boots to open mode.Why this is important; After a clean flash, the first boot creates the aegis keys for the device. These keys are different for open mode and closed mode, and if you have closed mode keys in open mode device you will have lots of random problems.
So, how this is done, is you need to clean-flash, and then immediately flash an open mode kernel before the device boots after the clean flash.In Linux (as well as Windoze) you can enter 2 flashing commands on the same row, separated by semicolon, so that when first command is executed, the second command is executed right after it:
sudo flasher -F firmware.bin -F emmc.bin -f -R ; sudo flasher -a firmware.bin -k zImage_2.6.32.54-openmode_l2fix --flash-only=kernel -f -R