: Use the credentials provided on the sticker at the bottom of the device. Common defaults are admin/admin or user/user , though many ISPs now use unique access codes.
If the default password on the sticker no short works after a firmware change, the firmware may have reverted to a carrier-standard password. Try using operator for the username and operator for the password, or contact the VNPT hotline (18001166) to request a remote reset. If you want to tweak your network further, let me know: Igate Gw020-h Firmware