Re: Software upgrade 7250
Was it even possible to update OTA on that OS? I don't know anymore, but I don't think so.
I think your only option (maybe) is to connect with the BlackBerry Desktop Software and see if it presents an upgrade. So far as I know, the other options that were available back in the day are no longer available. As tsac wrote, you can research and try links, but don't get your hopes up.
And as tsac wrote, if the device is working ok now for you, your best approach is probably leave it alone.