If you're on Unifi:
HG8240w: web interface is only available if you reset it with fiber cable unplugged. Once you plugged it back, TM's system will automatically remotely configure it blocking it again

HG8240h: web interface always available, but you can only login with root account as telecomadmin's password is changed. There's a way to bypass, figure it yourself


If you're on Maxis using TM's infra:
HG8240w/8240h: Web interface is always available. TM's system will automatically remotely configure telecomadmin's password to default