Downgraded back to 1.0.2 Problems

[Gyst35]

I just got my phone downgraded back to 1.0.2 and everything works fine, but when I put in my T-mobile sim, it says invalid sim. Is there a way to fix this (yet)?

[jeronemo]

i need to downgrade it to the 1.0.2 version...how did you do it????
thx