[Galaxy S II Q&A, Help & Troubleshooting] ScottsDesk:
Try this I did and it worked to get mine booting after a bad update.

I messed around with it using several methods of getting it to boot into download mode until I finally got it to do it. I think I left it plugged into the USB, powered it down until I saw the charging screen, then I proceeded to play with the different ways to hold the buttons to get it to download mode. If you are persistent enough and read a little on booting methods to get bricked phone into download mode you will succed if not then your not for the world of trial and error... the main thing is do the first steps I said before until it works

1. Get into Download Mode (WITH THE PHONE PLUGGED IN) by following the steps below

*Turn off the phone until you get to the charging battery screen (keep in mind, your phone is currently PLUGGED IN)

*Press volume up and down, and power all at once.

*As soon as the screen turns black, release your power button.

2. Unplug phone from USB

or try

2. Remove everything from your phone (SD card, sim, battery).

3. Plug your phone into your computer WITHOUT the battery, as you have already taken it out in the last step.

4. Press and HOLD vol. up and vol. down.

5. As you are HOLDING these buttons, reattach your battery.

6. You should be in Download Mode.

7. Unplug phone from USB

any how try try try until it works

Once in download mode

Get your files together for your phone, and use Odin 1.85.

Plug into Odin and make sure it shows yellow and its added!

1. Now if your files have like 3 files and the exact .pit file for your phone

I found mine here

http://www.droidevelopers.com/showthread.php?11722-Download-OPS-amp-PIT-files

2. Click the PIT button and browse to your exact .pit file for your phone *It should now have added a check in the re-partition box under the options area of the Odin window. If not CHECK IT!

***If you don't have your .pit don't worry about this unless you suspect, or have a bad partition

3. If you have just 1 file just click the PDA button and load the file. If you have 3 then you will load the PDA file in PDA, the Modem file into PHONE, and the CSC file into CSC, there are way too many phones to link all the files so get you stuff together!

4. Now hit start.

5. When done and the phone shows the first sign of starting up IE Logo or whatever... immediately unplug the battery from the phone to shut it down.

6. Now put it back in and start it in Upload mode by pressing Vol Up, Home at the same time then the Power button.

7. As soon as the phone shows the first sign of starting up IE Logo or whatever let go of all buttons and using the Vol Up down Choose the Clear Cache option and go through and make sure you factory reset it if you can just for good measure.

8. Reboot

9. Now when the phone shows the first sign of starting up IE Logo or whatever take out battery again to power off

10. Now put it back in and start it in Download mode by pressing Vol Down, Home at the same time then the Power button.

11. Once in download mode Hook up to Odin again and flash it with a root kernel for your phone. Do not ask me just find it. I did it took time but I got all the files together over several days of reading and collecting the correct ones.

12. When done and the phone shows the first sign of starting up IE Logo or whatever... immediately unplug the battery from the phone to shut it down.

13. Now put it back in and start it in Upload mode by pressing Vol Up, Home at the same time then the Power button.

14. In most roots you will now have a advanced or mounting options and more options to use.

15. I cleared the Cache again, Cleared the Davilik Cache, Went into a option and actually mounted the cache formatted the Cache.

16. Use the option now to restart the phone...

And mine started up installed the apps and I am up and running, nice and smooth and no issues so far

I hope this helps out someone whos just about to go off the deep end, as I was there and patience and trial and error came up with this step by step way to recover mine. Thank me by hitting the little thumbs up THANKS button below this post.

And if your so happy your phone is up show your appreciation by buying me a Pepsi

https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=E6M7UWKCZYSNE

scottsdesk