I'm personally betting something mis-fired when you tried to do the "save your root" step - some of the upgrading instructions I've seen out there don't really go to very great lengths to tell you the really critical steps if you want to keep root.
If you get busybox on there and you don't have any copies of su that are suid, then you basically have two options right now: 1) wait for someone to root Froyo on this phone (if I had the money to lose, I'd put money on a Droid2 root exploit being workable on the X as well) or 2) SBF back to 2.1 and give it another go.
I figured leaving another copy in xbin would probably not hurt if there's another OTA update that clobbers setuid /system/bin/su.
Success..Finally got Root back after losing it today from updating to Froyo. Even though I did move su to xbin, I had lost root. Here's what I did:
In Terminal Emulator:
/system/xbin/su (if you moved your su to the xbin before updating, this should grant you permission and you should see the # symbol)
Type the following after the previous command:
mount -o rw,remount /dev/block/system /system
mv /system/bin/su /system/bin/su.bak
cp su ../bin/
Again this only worked for me because I actually did move my su to the xbin directory prior to updating. Thanks Fwaggle and Jbeck22 at Mydroidworld for the scripts.
Last edited by Happystranger; 08-21-2010 at 01:28 AM.
Galaxy S4 - Stock (For now)