How to upgrade your Zyxel 660HW-61 (No VPN) into a 661HW-61 with 2 VPN
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- Go in Debug mode
- Download/backup the bootrom
- Modify the Feature bits from (or check)

P_660HW_61          92-4B
to
P_661HW_61          92-4B

- Save the bootrom back to the Zyxel

- Upload the 661HW-61 firmware