I didn't hold up much hope, so we switched to supplying our customers withYealink's, that and the issue we are having with the hook switch failing andnearly all 7841's. due to using poor components.
https://community.cisco.com/t5/ip-telephony-and-phones/how-to-upload-custom-ringtone-8841-multi-platform/td-p/4005741 Its a known bug/feature that's never been ported from SPA's