Never update firmware over WiFi. Nor from the upstream network.
Never allow your router to be accessed from the world.
It is your router, correct ?
When you downloaded the firmware (!) Where did you save it?
Did you make a backup of your firmware ? Where did you save that?
The file should have the extension .rom or .bin - if it is compressed you may need to extract it.
It sounds like this question needs a localised answer, you should check forums and your ISP's help pages before coming here.
But seriously, disconnect from the internet first, and use an ethernet cable.
It is almost certainly a Beetel 450tc1, but your ISP may have a custom ROM image you may be required to use. This is likely given the custom logo.
Seriously as well, ask your ISP.