SE Update Service Problem

I have a W300i.SE has stopped support for this phone.
I wanted to reinstall my firmware as I am not able to send messages which are longer than 160 characters(1 message). I had sent messages of longer length earlier(upto 10 message length). So i wanted to try this reinstallation.
I dont have my phone listed in it. So i cant reinstall.
How can i do this ?

Also i found out that they are not supporting re-installation of any of the phones... :-@ (What happened to them ?)
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