[Q] Unable to Root MyTouch 3G (3.5mm) with v2.2.1

So I just got the FROYO update to my T-Mobile MyTouch 3g with the 3.5mm jack. I HATE IT. It runs slow, freezes, lags, etc. I decided I'd try to root my phone and just install a different ROM. I've searched the forums and followed the "Ultimate Guide", but I get stuck when running SuperOneClick (1.6.3). I have a feeling it has to do with the NAND lock, and so far I've yet to find a way to "S-Off" so that SoC can finish successfully. I really wish I had never taken the update, i was really happy with 1.6, now my phone sucks. Here's what i get with SoC:

Reading OS Version properties...
Version: 2.2.1
OK

Remounting system with read-write access...

OK

Pushing su-v2...
failed to copy 'C:\Documents and Settings\wscott5\Desktop\phone stuff\SuperOneClick1.6.3\su-v2' to '/system/bin/su': No space left on device

OK

chmod su...
Unable to chmod /system/bin/su: No such file or directory


OK

Pushing Superuser.apk...
failed to copy 'C:\Documents and Settings\wscott5\Desktop\phone stuff\SuperOneClick1.6.3\Superuser.apk' to '/system/app/Superuser.apk': No space left on device

OK

Remounting system with read-only access...

OK

Running a SU test...
Test failed!
FAILED
ro.product.brand=tmobile
ro.build.date.utc=1291961525
ro.product.model=T-Mobile myTouch 3G
ro.build.date=??? 12??? 10 14:12:05 CST 2010
ro.build.version.codename=REL
ro.build.tags=release-keys
ro.com.google.clientidbase.vs=android-hms-tmobile-us
ro.com.google.clientidbase=android-tmobile-us
ro.product.name=htc_sapphire
ro.product.device=sapphire
ro.build.type=user
ro.build.host=HPA004
ro.build.version.sdk=8
ro.build.display.id=FRG83D
ro.com.google.clientidbase.ms=android-hms-tmobile-us
ro.build.id=FRG83D
ro.build.version.release=2.2.1
ro.build.user=
ro.build.version.incremental=300801


Hope you can help, thanks!

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