How to update windows phone 7 to win 7.8 [HTC HD7] topic

Hi guys,
Recently my HTC HD7 was crashed. then i was installed ROM and IT's windows phone 7. How to update windows 7.8
I have no idea about that. please tell me how to do that.

i installed this.
RUU_Schubert_TMOUS_1.20.531.01_Radio_5.51.09.11a_2 2.31.50.09_Signed_SCHUBERT_RELEASE.exe :rolleyes:

yeeh i m noob :'(