[AT&T Samsung Galaxy S II Skyrocket SGH-I727] dannyblunts:
THIS GUIDE IS FOR ANYONE WITH A GALAXY SERIES PHONE WHO BELIEVES THEIR DEVICE IS "BRICKED," IN A NON-WORKING STATE, IN A BOOTLOOP (CAN'T GET PAST SPLASH SCREEN,) OR WITH A STUCK POWER BUTTON

In no way am I a connoisseur of these android devices, but look around on the forum, I couldn't find any guide for anyone with a bricked phone, or at least for my device, so I'm all you've got.

I'll list the steps that I took in order. My device wasn't bricked after all, it was just the power button, and I'll cover that later.

STEP 1: Stay calm. I was pissed when I thought my device was bricked, but you need to be careful, they aren't literal bricks and they can't take too much of a beating. I emphasize on too much because these devices are quite durable, but don't throw yours through the living room wall because it wont turn on for you. If your device is easily repairable and you break it in a rage fit, whose fault is it then? Keep calm and continue with this guide.

STEP 2:

MAKE SURE YOUR POWER BUTTON ISN'T STUCK!

DO NOT continue past STEP 2 until you've tried everything to make sure its not the power button. IF, and ONLY IF, you've spent about 30 minutes wiggling that little bastard and cleaning it thoroughly can you continue to the next step. If you haven't tried anything yet, then I'll begin. You're gonna start by taking your device, facing the side with the power button downwards, and gently, but not very gently, tapping it on a table, your hand, something to get your power button unstuck. Tap it on something for about 30 second intervals, trying to turn your phone on in between intervals. If you've done this about 10 - 15 times, then let's move on. We're gonna try what fixed my phone. If there's a possibility that it's still the power button being stuck that's keeping your device from booting, it's gonna be the next thing I talk about. Something is in your button. A sticky substance, I should say. You've gotta clean it out thoroughly, and I have two ways that will work.

Method 1: Go purchase yourself a can of keyboard dust-off spray. Stuff comes in handy for a lot of electronic applications, and it fixed my device, so I'm grateful. Anyway, you're gonna take your can of dust-off spray, and spray it towards the power button on your device, trying your best to get most of the spray in the gaps around the button. Do that for 30 second intervals, powering on in between, etc etc. If that hasn't worked, there's two things you can do. Continue with this method further, or move on to method 2. Continuing with Method 1 requires a knowledge of electronics. You're gonna have to open up your device, by removing all the screws showing under the battery cover. IF YOU'VE NEVER OPENED YOUR DEVICE BEFORE, LOOK UP A GUIDE ON YOUTUBE. I can't really show you a visual, so look for a youtube video on how to disassemble your device. Once you have pried open your device, check out the little white button where the power button lays over. Is there anything sticky on or around it? If so, CAREFULLY scrape it off with a needle or a razor blade CAREFULLY. If there isn't anything sticky on it, spray some more of your dust-off into the small white button. Don't worry if it looks like the spray is turning into liquid on contact with your device, the liquid will vaporize almost instantly. After you've sprayed a decent amount into the button's area, take your battery, and hold it in the position it would be in your device, parallel with the rest of your phone, and touching the contacts. Once you're holding the battery securely to the contacts with one hand, take a pen or your fingernail and press the small white button with the other hand. Does it turn on, and if so, does it get past the boot loop? If you've gotten past the boot loop like I did at this step, then congratulations, you've saved a bunch of money on phone insurance! If your device isn't turning on at this step, and it was turning on beforehand, your battery isn't all the way touching the contacts, or you've disconnected a flex cable. Check for both of those things. If its not either, then you've probably broken your device when you opened it, which isn't my fault. If you're still at a boot loop, try some more spraying and repeat the steps. If you've done this a couple times, and it's still boot looping, continue to method 2, or go on to step 3.

Method 2: Open your device how I explained in the last method. Get rubbing alcohol, and a Q-tip or a toothpick. Dip your applicator into the alcohol, and apply generously to the white button where the power button overlays and surrounding areas. Let it air-dry, or blow it all out, then take your battery, and hold it in the position it would be in your device, parallel with the rest of your phone, and touching the contacts. Once you're holding the battery securely to the contacts with one hand, take a pen or your fingernail and press the small white button with the other hand. Does it turn on, and if so, does it get past the boot loop? If it doesn't turn on after this method, and it was turning on prior, check to see if the battery is all the way in, and check if you disconnected any flex cables when you opened your device. If its not those two things, you've probably broken your device when you opened it, good job. If you got past the boot loop. congratz, you never had a bricked device. I made the same misinterpretation. If it's still boot looping, try this method 2 or 3 more times before continuing.

IF NEITHER OF THE TWO METHODS FOR STUCK POWER BUTTON WORKED, YOUR DEVICE IS PROBABLY BRICKED. MOVE ON TO STEP 3.

STEP 3: Step 3 is just about where I bid you ado. You have a bricked device, and I'm quite sorry for your loss. You have a couple of options at this point.

OPTION A: SEE IF YOU CAN GET YOUR DEVICE IN DOWNLOAD MODE. If you can't get it in download mode, then I'm sorry. If you got it in download mode, YOU MIGHT BE SAVED. I couldn't keep mine in download mode for more than 2 seconds. Once she's in download mode, start up Odin, and boot your stock ROM. NOT CYANOGEN, NOT A CUSTOM ROM, get your stock ROM on the phone ASAP. If you can't get this option to work, move on to the next options.

OPTION B: Take your phone to [insert service provider here] and check if she's under warranty. You better hope, since the other options aren't very bright/cheap. If she's not under warranty, or they're gonna charge you over 100 dollars to replace her, then try some other options.

OPTION C: Get the USB dongle. It'll be your lord and savior if it keeps your device in download mode. Purchase one of these either way, they're dirt cheap and useful as hell. Once she's in download mode through the dongle, connect to your PC, start up Odin, and BOOT YOUR STOCK ROM. NO CUSTOM ROMS. Google your device's stock ROM, download and install it. If the dongle did you no good, then go to option D.

OPTION D: JTAG device wipe. That doesn't even sound healthy, does it? Think of it as open heart surgery for your device, but its a lot safer. Go to bricked my phone . com (I can't post links) they will unbrick your device for a short fee, and it'll be good as new. These are just about your only options. I went to multiple phone repair stores and they denied me service based on the fact they thought my phone was bricked, and mine wasn't even bricked. Get it JTAG unbricked, and you're good to go.

If this guide helped you in any way, there's no need to thank me. Thank a good sum of the community for attracting me to this site, as well as not putting up a guide for unbricking SGH-i727, motivating me to do one. If your device was broken due to my guide, not my fault. You're either a noob at electronics, or you opened your device with a hammer and nails. Thank you xda community for everything you've helped me with device-wise, I'm returning the favor.