wil6210: low level sector API

Hi,

I am working on wil6210 sector control. Now I think I can successfully
call these 4 functions( set_cfg, get_cfg, set_selected and get
selected index) but it looks like it does not work well because, in
the next Beacon Interval, TXSS will set a new TX sector again. My
question is how I can disable TXSS. One way I found in the wmi.h is
setting the number of sectors of TXSS to 0 or 1 by using
wmi_prio_tx_sectors_num_cmd so that the TXSS will only use 1 sector.
However, when I called this cmd, I got this error:

wil6210 0000:03:00.0 wlp3s0: wil6210_irq_misc: Firmware error
detected, assert codes FW 0x00001038, UCODE 0x00000000
wil6210 0000:03:00.0 wlp3s0: wil_fw_core_dump: fw core dumped, size 823296 bytes
wil6210 0000:03:00.0 wlp3s0: wil_notify_fw_error: Notify about firmware error

So I am wondering whether the firmware does not support these kinds of
wmi commands. Does anyone have any experience on this? Thank you.

Thanks,
David