I just had the problem of bootloader Red, Green, Blue screen and then Windows Mobile screen where it froze. After days of trying different suggestions I downloaded the software update here h**p dl4.htc.com/RomCode/TMobile/Dash_Software_Update_1.22.531.8.exe not sure if link will work but east to find on T-Mobile website ran the program from the bootloader red green blue screen (Device off hold camera plug usb in while holding) ran it and poof up and running and then reflashed custom ROM again