[Upgrading, Modifying and Unlocking] Ultimatetechworm:
So You are having a hard time rooting your droid x .621? That okay heres the run down frankc123 had a good walkthrough though he left out one small part i added it for the noobs.Also for simplicity purposes suggest you put the files "sbf_flash" and the "mb809" into downloads and copy and paste the coding into the terminal. If you go to Frankc123 thread on the droid x .621 youll see the files attached.

Information is as follows

1.) Download the latest Ubuntu iso for your system. Most processors these days are 64 bit, but if you're running on an older computer or do not know if you have a 32 or 64 bit processor I'd recommend doing 32 bit just to be safe (64 bit processors can run both 32 and 64 bit distributions, but 32 bit systems cannot run 64 bit distributions.) Side note: you can download other distributions, but if you do you will not be able to create the persistent drive using the USB method. It should also be noted that some older systems cannot boot from USB, most newer systems (post 2000/2001 IIRC) can boot from USB, however you should consult Google to verify for your system.

2.) Burn the iso:

2.a If you have a cd burner and blank disc, this is the easiest method but, again, you will not have a persistent drive you will just have a Live CD. Use an iso burner to burn to cd, then skip to step 3a.

2.b If you do not have a burner, a blank disc (or don't feel like wasting a DVD disc) but have a free USB drive (with at least 2 GB of memory, bit overkill but it has to be big enough to hold the iso + changes + the persistent "drive") then I recommend downloading either unetbootin or universal USB installer. Go to either web site and follow their instructions. If you use Ubuntu, you'll have the option of creating a persistent drive, which is basically a fake-partition that allows you to save files to when you reboot Linux after running this Live USB. I would recommend using a persistent size of at least 200 mb so we can save the SBF file and sbf_flash. If you created a persistent drive go to step 4. If you opted out of this, skip to step 4.

3.a So you have a Live CD now. If you have a spare flash drive, load up the 604 SBF and sbf_flash. Either way, you'll need to proceed to booting into linux, go to step 4.

3.b Once the respective application has finished, copy the SBF and sbf_flash file to the persistent drive listed in windows.

4. Now we need to boot from your Live image. Restart your computer. When your computer is booting up it should give you two options, "Enter BIOS" and "Select Boot Order" or similar. For my Lenovo Laptop, I can hit F12 to change the boot order, and from there I can select my USB port and it'll boot from there. If you do not see a boot order option, you will need to go into your bios and change the boot order manually. Again, you will need consult Google for this as the menu selections vary by system. It really isn't that hard to figure out if you go through the menus, but I strongly, strongly, strongly recommend and encourage you to google your motherboard's manual to verify what you need to change if you don't know what you are doing. You are responsible for any changes you make on your system. Your BIOS is crucial for your system to function properly. Once you have found where to change your boot order, select the respective drive (USB, or your CD/DVD drive). These will be listed by the manufacture name (so SamsungXXXX for a Samsung drive or PNYXXXX if you're using a PNY usb stick.)

5. When Ubuntu boots up, it'll give you an option to run "Live" from the CD/USB. Select this option. Installing to your hard drive could mess up your current OS install, and I'm not going to get into partitioning here. Once you've gotten into Ubuntu, select "Dash Home" in the upper left hand corner, and then type terminal in the search box. Click terminal, then open it up.

6. Now you'll need to get to where ever you have the SBF and sbf_flash stored through the terminal. If you chose to use the boot cd, and did not have an available flash drive, you will need to download the SBF from here, as well as sbf_flash and then extract them to the same folder. The default is "Downloads" and I recommend just extracting them to that directory for simplicity.

6.a If you had to download the SBF/sbf_flash, getting there through terminal is rather easy. All you'll need to do is type these commands into the terminal:

cd Downloads

chmod +x sbf_flash

./sbf_flash mb809-2.3.5.sbf

sudo ./sbf_flash mb809-2.3.5.sbf

And then let the program do it's work. When it's done, go to step 7.

6.b If you already copied the required files to a USB drive, we need to get there through terminal. Type these commands:

cd /

cd /media/

ls (This command will list all the drives connected to your system, cdrom, usb, etc. If you used the Universal USB installer it will list the USB drive as "PENDRIVE", I'm not sure what the default is for Unetbootin but you should be able to figure it out and if you just used a spare device it could be completely random.)

cd drivename (obvioiusly this will vary based on the USB method, for me its "cd PENDRIVE"

If your files were just on the main drive, you don't need to do anything else but the following commands. If you put them in another folder, you will need to do "cd foldername" without the quotes obviously. When you're in the directory with both the SBF and sbf_flash you will need to do these commands (again, ignoring the '-'):

chmod +x sbf_flash

./sbf_flash mb809-2.3.5.sbf

And then let the program do it's work. When it's done, go to step 7.

7.) After sbf_flash is done, you'll need to restart your computer. Its recommended you remove your boot media (cd or usb drive) so that Windows can boot normally. If you changed the boot order in bios you will need to change it back to what it was before, otherwise whenever you have a CD/USB stick plugged in your computer will automatically try to boot from it, and get pissy if it can't boot from the media.

8.) Once you're back in windows you'll need to run the zergrushv4 root method. From there you can do whatever you want. You still cannot SBF to previous versions (602 or 605) and you cannot run Froyo roms.

Any questions please feel free to comment