Telstra has OS 4.1.0.268 code available for the 7250 handhelds!
https://www.blackberry.com/SoftwareD...ient=eiKaMQ2dL
Using the information from the various OS upgrade threads here I've successfully installed the 4.1 OS onto my Bell Mobility 7250. So far everything is working well ... first impressions are that the handheld is actually running a little quicker than with the 4.0 code. The browser loads and renders very nicely. I'll report more as I run more tests.