lacp config

I'm doing some troubleshooting with our network group enabling/disabling lacp on my trk configs.

I built a ethc trunk on cge0 and cge1, run the command to enable lacp but I'm trying to reconfigure the trk back to ethc without deleting the trk and recreating it. but the same command to enable lacp using ethc as the option instead doesn't work.

to change to lacp (default lb is ip)

server_sysconfig server_2 -pci trk1 -o protocol=lacp

and if I use this:

server_sysconfig server_2 -pci trk1 -o protocol=ethc

it doesn't change to ethc. Is it possible to disable lacp once it's enabled?