Tutorial [Q] Downgrading the E971 Rogers

I did an OTA update to software version E97110e.

I managed to get my hands on the Rogers E97110d firmware here: http://forum.xda-developers.com/show....php?t=2036404

My problem is I do not know what to do with the Rogers .TOT file (the only file included with the download)

Can anyone guide me through the steps do downgrade, or am I boned because of the OTA update?