New ROM for SMT5600?

[Guest mmmaiki]

I have an AudiovoX SMT5600 (HTC Typhoon), originally locked to ATT Wireless. Now it is both carrier-- and application-unlocked, and I am using it on T-Mobile USA.

When I go to Settings, About, I see the following versions listed:

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Windows Mobile 2003 Second Edition

Version 4.21.1088 (Build 14257.2.0.0)

Radio Version A.10.01

Total Storage: 27.98 MB

Total Memory 21.62 MB

Processor ARM OMAP 720

ROM update versions:

Operator: 1.1.40.0

Manufacturer: 1.1.58.80

Microsoft 4.21.14257.0

Language 1.1.58.80

File System: 4.21.14257.0

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Is there a newer ROM that I can download and install to this phone, that will improve its capability, fix bugs, etc.? If there isn't one made specifically for the Audiovox SMT5600, is there one for another branding of the HTC Typhoon, that will work on this phone?

Thank you for your assistance.