Help please?!?!

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http://forums.androidcentral.com – ok guys so my htc evo 4g shift is stuck on the white screen with the green htc letters... i dont know how to re-install android, i have tried to flash hboot but it says sending 'hboot' (512 KB)... OKAY [ 0.173s] writing 'hboot'... (bootloader) signature checking... FAILED (remote: signature verify fail) finished. total time: 0.322s Any tips? (HowTos)