$5 dollars???? that's it?
there is no development support for your phone so there is no custom rom. someone will have to create a custom rom specifically for your phone. that is no easy feat. plus they would need to somehow get a hold of a firmware update for the phone.....which usually the manufacturer or carrier provides, but somehow i doubt there is one for your phone.
all of the above is hard work and does not come easy and all you are offering is $5???? good luck with that
this is what you get when you buy an off brand device.....pick a better phone if you want to root it and flash a custom rom.