My AC66U_B1 was running 384.7_2. "New firmware version check" was disabled. Upgraded to 384.8, update notification appears. Manually set the flag per your instruction, notification disappears.
Upgraded to 384.8_2, notification not present.
Unset the flag for testing:
Code:
admin@router:/tmp/home/root# nvram show | grep webs
webs_notif_flag=
webs_last_info=
Enable new firmware version check, click on check:
Code:
admin@router:/tmp/home/root# nvram show | grep webs
webs_notif_flag=
webs_last_info=
webs_state_update=1
webs_state_info=384_8_2
webs_state_url=
webs_state_info_beta=384_8_beta2
webs_state_flag=0
webs_state_error=0
webs_state_upgrade=
Seems to be working fine now.