Beetel 450TC2 : Multiple device Wifi access issue has been resolved

I had issue with multiple devices accessing the beetel 450TC2 Wifi.
This has been resolved. Just thought of explaining the same here.

Couple of months back I wanted to get a broadband connection and
approached Airtel for the same. They said, they don't give modem.
Hence, bought a beetel 450TC2 from a shop.

The Airtel person came and replaced the default firmware with a new
one and rebooted the 450TC2. When the screen came up it said beenatone.
I asked him why it is showing beenatone. He said, the default firmware
will work for one wifi device only and this beenatone firmware will
work for multiple wifi devices.

After this, I was able to use multiple wifi devices to access the internet.
But one peculiar thing is the DSL, internet lights were not glowing,
only power and WLAN lights were glowing. Like the one below.

After some time the modem started giving problems, like I will be
using the internet and suddenly the wifi will go off or after I shutdown
and bring back my system it may not be able to recognize the wifi.
I will have to go to network preferences in mac and remove the preferred network
and connect again. And the internet connection was inconsistent for several weeks.

Hence, I took the modem to the beetel service center in thousand lights.
They said, since the firmware has been replaced, it would have affected the IC.
And sent the modem for repair. He said, even though it is under warranty it will
cost Rs.300/- to service the modem. The person at the service center was
very helpful. He gave a standby 450TC1 for me to use.

After about a week, he called me and said your 450TC2 is ready. I went
there with my laptop, phone. Tried accessing youtube with both the devices
with wifi. One of them worked and other didn't work. Informed about the
same to them. They replaced the firmware again, with a new firmware.
I think it is from beetel itself. Then I was able to access youtube with
both the devices.

After coming home, I checked the same again with multiple devices and it
started working. So far no issues. Hopefully it continues this way. Apart
from power and WLAN, DSL and internet lights started working. like the
one below.