you are already 'rooted'
you just need to read http://forum.xda-developers.com/showthread.php?t=831139
Why should you root your Dream/G1?
follow this link and youll be fine
Use amonra 1.7.0 when in telnet just type
flash_image recovery /sdcard/recovery.img
After this turn off phone and boot into recovery, flash radio then spl then rom here
Look at that link again I think you have two guides combined the link is in your post is the one to follow
Sent from my HTC Vision using xda premium
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