What i noticed in the .2678 firmware (warning: very unscientific).
I've been running an n66u in a room in repeater mode connected on 5ghz (intended devices connect on 2.4ghz of n66u) with the ac87u in living room (4 concrete walls inbetween); the n66u was the model that i upgraded from. I know this set up completely blocks the potential of the high throughput in the ac87u 5ghz, but it's the best way to get usable (& rather fast) wifi in my room and masterbed room, planning to sell off the n66u for an ac repeater so this is a temp setup.
Anyways, firmware prior to the .2678, the link rate fluctuates between 246mbps - 346.5mbps regularly. In .2678, the link rate die die remains stable at 300mbps. So, my unscientific observable is that .2678 somehow made the 5ghz on the ac87u to handle noise better and maintain stronger link throughput.
top 2 results are after firmware upgrade, the next 2 is before. (speedtest: ip5s)
Hi square, the firmware loaded in your router as factory loaded firmware requires you to downgrade switch control to LEVEL 1 CTF as mentioned by Asus@SG.
My suggestion is to use your old router, get online and download the latest firmware .2678 from asus support site, or from a link in this thread which maylyn has posted.
Once u have extracted the firmware on your desktop, replace your ac87u again and then try to access the GUI at 192.168.1.1
You should be able to access the network map. Once u r there, on top of the page displays the firmware version, click it and it brings you to anither page for u to upload the new firmware you just downloaded.
Once everything is done, use the reset button on the router, press it for 5 seconds then release. Router is kinda retarded, but assured that it will reboot itself after a few seconds of releasing the button.
Now after you reset, everything goes back to default values and with the new 2678, LEVEL 2 CTF is still enabled by default but is now compatible with singtel fibre..
So you are first time using ASUS routers for SingTel Fiber? If so suggest you to call up SingTel customer support first to move the Mio Voice to the ONT. (Your ONT) should comes with 2x RJ11 telephone ports so you can totally remove your Aztech router from your setup. ASUS routers does not come with RJ11 telephone ports
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