A7: You can change it at any time. Log in to 192.168.10.1 using your management password, then go to Basic → Internet and select the correct mode.
If you have trouble accessing the management page, connect your computer directly to V2700 with an Ethernet cable and try again.
Alternatively, press and hold the Reset button on the back of V2700 to reset the device. After restarting, V2700 will return to the initial setup process with Router Mode as the default.