Death after flashing ROM

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Please help me. I am desperate.

I have flashed my Telus HTC Touch Diamond with the "Telus_shipped french" ROM, following steps by steps the guide "Flashing a Rom or Radio from the 4 gig internal storage ".

My phone is stucked at the rainbow screen showing the following error message: "upgrade ROM code error. Please try again". No hard reset, no nothing will fix it.

Thx

connect it to ur pc when its in bootloder (the rainbow screen) where it says serial at the bottom it should now say usb, now just use a ruu to flash a new rom

Thank you so MUCH mancsoulja. I did not try it because after the flash my PC was not able to see my Diamond through the USB connection, so I thought that...

Just a question. How do I know if I should use the ROM for CDMA phone or the one for GSM?