Rooting without an SD Card

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OK so I know this is an odd one but my G1 has a weird problem that makes it so that it can't recognize the SD card when I boot it to the bootloader. Is there any way to root it from an ADB connection? I rooted it before with the JF mod but I had a bunch of problems and wiped it back to a vanilla install. I'm trying to put Cyanogenmod on there and it seems like it would be possible but I don't have the knowledge to do it.

Without an SPL that supports fastboot, then no it's impossible without an SD card.

What issue are you having with the SPL? The file is named DREAIMG.NBH?

What is your build version? Have you tried the flashrec method?