Fix Black Screen with pulsating blue LED light on Galaxy S5 G900A

Here comes the new problem ended up into a black screen after restoring back to stock.  This problem only occurred to those who already accepted and upgraded the Lollipop OTA update G900AUCU3BOC4.  Either one has messed-up from trying to root, installing custom recovery and or trying to downgrade from Android 5.0 to Android 4.4.4 and 4.4.2. Now since downgrading is no longer possible, because of the new intensified secured bootloader of the Lollipop update. And one more thing, there are no available stock firmware on Galaxy S5 SM-G900A from the last four OTA updates, including the Lollipop G900AUCU3BOC4.  The only available version for fixing soft-brick is the old "NCE" which can is an Android 4.4.2. Flashing the 4.4.2 KitKat stock firmware file on-top on Android 5.0 Lollipop  "OC4" will subsequently result into black screen and there is this pulsating blue LED light you've noticed.




How to recover from black screen with pulsating blue LED light on-top of Lollipop update

Below is the step-by-step guide on how to recover and bring your Galaxy S5 SM-G900A to life that has now showing a black screen with blue LED light

Grab Odin flasher and USB driver
  • Odin flasher – Odin3_v3.09
  • Grab USB Driver - USB Driver or install  Kies 3
  • Download these files: (credits to muniz_ri from XDA-developers)
    G900AUCU3BOC4 Stock partition (link)
    G900AUCU3BOC4 Stock Modem  (link)
  • Please use Windows OS PC or laptop as this method will not work on Mac.
  • Recharge your battery using external battery charger since you can’t recharge it within the phone for it is already bricked.

Step 1.  Run Odin on your computer.

Step 2. Reboot your Galaxy S5 SM-G900A into download mode screen. Turn it off, once completely shut down hold down the ‘HOME’ + ‘VOLUME DOWN’ buttons and press the ‘POWER’ button for about 2 seconds until a WARNING! Screen appears. Press the ‘VOLUME UP’ button to continue or enter Download Mode.

Step 3. Connect your Galaxy S5 SM-G900A phone to PC using the supplied USB data cable. Then make sure you can see the phone “Added” in Odin log-cat or a  COM:ID  turns into bluish color once the device is being connected.

Step 4. In Odin options, DO NOT tick ‘RE-Partition’ ONLY Tick ‘Auto Reboot’ and ‘Factory Reset Time’ and nothing else.

Step 5. Flash the AP file Only without losing user data
Now simply click the AP button and load the "G900A_OC4_Stock_Partitions.tar.md5".

Step 6. Click on “Start” to begin flashing the stock firmware.

Step 7. Wait ’till it finishes flashing it's likely you'll see a huge message that says "PASS!" .

You may repeat the process if the flashing fails.

Once the flashing is done, check the phone if it's now fully working and have had rebooted normally again.  You may then flash the stock Modem G900AUCU3BOC4 Stock Modem, using the same process above to fix any further issues.

If the phone rebooted but still stuck in boot loop, stuck on welcome screen logo. Just perform wipe data factory reset.

- Turn off the phone and set it into recovery mode
- Press volume “volume up, home and power buttons”
- Once in recovery mode, perform full wipe
- Select ‘wipe data/factory reset’

If this resolved and fix  your phone, then let me know. However, if not then there is nothing I can add here but to advise you to visit your nearest service center to bring your phone to life.
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