Unlike Unifi which uses AIO ONU +router combo, Maxis provides separate router and ONU. I'm not sure how's the performance of their router now, but you could easily replace with own better router with this setup.
My personal experience, I find Maxis has less congestion at night compare to Unifi.

Bundle with postpaid I presume? Worth if you ask me, if you don’t have issue with UniFi, you shouldn’t have much issue with Maxis too since you will be using the same infra.

Nego more

nice, why maxis customer never get this promo.

Both, as an existing customer I never get a call from sales to upgrade. Paying RM149 for 500mbps and RM79 for postpaid

If I remember correctly, it's under WAN settings for ipv6 WAN.

Not sure if you can only enable ipv6 without WAN ipv6.

If it's the KAON wifi 6 router, the admin login should be either below.

Option A
username: administrator
password: router serial number

Option B
username: MaxARSysOpr
password: !!bestHOME!!XXXX (last 4 s/n)

Then try Enable the DHCP Server for both IPv4 & IPv6
Then use Stateless ipv6