hi guys happy new year , I seem to have messed up my htc hero last night I went back to the official 1.5 rom by flashing a backup and it as fine but then I tried flashing the official 2.1 but it didnt go past the boot screen so I tried going back into clockworkmod but it just came up with a red triangle it goes into android system recovery 2e instead but wont let me flash anything keeps saying its siganture failed ,, please help me out guys asap as im now phone less , thanks