If you did all correctly and you still, after 20 minutes, in HTC green logo that mean the partition is too small so if, for example, you did a 170MB Partition in flash.cfg file, make it 200mb and reflash the Rom following the steps from Task29. Task29 is recommended all the time if you want reflash or flash a new rom.
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My Evolution: Sony Xperia Z1 - UB + 4.3 Rooted + Deodexed, HTC HD2, HTC Diamond 2, HTC HD Blackstone, Nokia 7070 Prism, Qtek 9100, Nokia 3100, Motorola T720i, Nokia 3310, Sony Ericson PF 768 (Blue)
How Get Root on Sony Xperia Z1 with Locked Bootloader and the Latest Android 4.4