[Q] Trying to fix data wipe failed issue, encountering more problems topic

I am currently following the instructions found here: http://forum.xda-developers.com/show...62&postcount=4

I get to Step 3:

3) Copy the Froyo 5.2 Voodoo-stable-5.2-Froyo-2.2.1-GT-I9000-unsigned-update.zip for i9000 to your Vibrant /mnt/sdcard/update.zip via phone file manager or adb push... Then do 'adb reboot recovery' to put the phone into recovery mode or the 3 button push method.

But it keeps telling me Permission Denied. I'm using the command: adb push Voodoounfix.tar /sdcard/update.zip

I tried fumbling my way around adb shell since I was able to get permission that way by entering su but I cannot find the commands to upload the Voodoounfix.tar file to the /mnt/sdcard/update.zip location.

Whenever I try to access the cdcard location I get the following error: can't cd to sdcard

I'm really ecstatic that I got this far, my Vibrant is going to my teenage son who doesn't have a phone and I would really like to get this working. Any suggestions would be great. Thank you.