Ok, for Mac users (OSX). First the setup.
Download SDK: Android SDK | Android Developers
Extract and place the folder somewhere (doesn't matter where)
On your phone, make sure USB debebugging is enabled.
Reboot to recovery. Connect USB to phone/computer.
Go to partitions menu and select mount SD card.
Now you need to path to the tools folder in SDK. Open the android_sdk folder, you should see a bunch of folders in there, amongst them a "tools" folder.
Open terminal. Type cd [hit space bar]
Now drag the tools folder to your terminal window and it should propogate the path for you. Hit enter.
In terminal, type ./adb devices
If you see your device, then you're good to go. Notice that for Mac's you need to add the "./" in front of adb commands.
Now you can follow the commands in the post I did before. Just remember for Mac's it's ./adb shell, not adb shell. All other commands are exactly the same, no need to add the ./
Ok I would do a google search for rsd lite and droid x sbf. I'm not super experienced in this field so I can't exactly walk you through the steps and I think forum rules are a little iffy so i'll post this link and see if it helps you.
To boot into the bootloader on the droid x you power down completely, hold the down and camera buttons at the same time.
This will boot you into the bootloader.
From there, flash your sbf.
EDIT: this is the only place to sbf from, if you're not in the bootloader, you're doing it wrong.
Recap:
Hold Down
Hold Camera
Hold Power
When it turns on it has a screen that says "Bootloader Version 30.03"
Let go of buttons (you might have to tap the power button once to turn on the display as well)
From here connect your USB cable to your computer
Depending on your operating system get either
RSD_Lite (windowz)
or
sbf_flash (linux)
if you're on osx you'll have to virtual machine to windows or find a friend with windows
make sure you have the current sbf file for your firmware
e.g. 2.13.15 for 2.2 Froyo (from rootzwiki, it's like the first file, labeled "SBF")
Step One:
Turn off your phone
Step Two:
Hold the Down Button (lower part of top right of phone when looking at it)
Hold the Camera Button (lower right of phone)
Press Power
You should see a black screen with white text that says "Bootloader"
Tell me if you can get here
EDIT:
Also tell me your operating system
