Tried to Flash new Radio now stuck....

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Hi,

I am a noob to Android have been WM for many years. Anyway I tried to flash a new radio to my T-Mobile Hero, now its stuck on a picture of a box with a arrow pointing towards a phone. Its been like this for one hour now. I tried flashing using fastboot recovery from the sd card. I thought I had rooted the Hero but am not sure if it completed correctly. What can I do to get it powering up again?
When I press the power and back button just that picture appears for ten seconds and then the handset seems to turn off. No lights, nothing I have to remove the battery and then when I press anything the same picture appears.

Any help will be appreciated. Thanks in advance.

Hi,

try to get into recovery and reflash the radio

turn your phone off.

press Home+Power on and hold Home pressed.
Your phone should now go into recovery.

You should consider to install a more advanced recovery.

Here is a nice one.
http://forum.xda-developers.com/showthread.php?t=561124

BR

phlo