I dont know ifit will work for your w850....but worked with my k800!
I used XS++ and as I connected the phone, the program updated the CID (it asks if u want to).
Make sure the battery has a good charge or try to use an universal charger (cos many problems appears due to low battery)! And even more important certifie what FS, MAIN an CDA you are using, and if they're compatible with the CID
Try to post what the Setool shows to you and write what FS, MAIN an CDA you're using

Hope it works
\,,/