How to fix Galaxy J3 Luna Pro won’t charge or turn on after an update issue

We sometimes get reports from Android users that their working device has suddenly died or has stopped working following an update. In this post, we show you the options that you can try if a Galaxy J3 Luna Pro won’t charge or turn on after installing an update. Keep in mind that basic troubleshooting like forced reboot, checking the charging port, using a different set of charging accessories, or trying a new battery have been ruled out because the user has already tried them before contacting us. If your own J3 Luna Pro has the same problem, make sure to conduct basic troubleshooting first before attempting a bootloader flashing.

Problem: Galaxy J3 Luna Pro won’t charge or turn on after an update

I have a Samsung Galaxy J3 Luna Pro. I’ve had this phone going on around 5 months with no problem. Was cleaning up my phone one day about 2 weeks ago to free up some space, when I noticed I could install a new update. I found myself doing this asap. After this update I found my phone no longer charges while it’s turned on. It was charging while off, but last night it stopped doing that. I will turn the phone off, plug the charger in, and it shows the bolt inside the battery and that is where it freezes. So I have checked the cables, power outlets, plug ins, I’ve cleaned the ports, ect. I’ve Google and Google, master reset and forced recovery mode… still nothing is working. My husband owns a Samsung galaxy j7 and we have been switching batteries out while the dead one will charge right up in his phone, then I put it back in this one. I’m at a lost as what to do. I can rule out that it’s not a bad battery, bad charging cables, dirty ports… ect. I know this newest update has caused my phone this problem. I think it is in the firmware but have no idea how to fix it. I can’t uninstall this update because i don’t khow and I can’t install a new one and hope it fixes it because there isn’t one I’m running the latest software update. Please help me. I’m dying here and this absolutely sucks. Ps I’m not sure what the version update is on this phone. It’s the newest one for j3 Luna pro.

Solution: There’s very little to do in terms of troubleshooting if your phone won’t turn on. If it worked normally before the update, there’s a chance that it’s boot up sequence has been corrupted during or after an update. Your device can still possibly turn back on but the code (called bootloader) it needs to prepare and fire up Android operating system may had been corrupted. This situation usually happens when a user tries to manually install a firmware via flashing, or in rare occasions, during legitimate over-the-air updates. When an issue like yours occur following failed flashing, a user can usually try to reflash the bootloader to bring it back to its normal working order. Though not a guaranteed solution, it sometimes work. Since your issue occured (we assume) after an over-the-air update, which means that the update was provided by Samsung or your carrier, we don’t think flashing the bootloader will work. You can however give it a try before you contact Samsung or your carrier for repair or replacement.

Below are the general steps on how to flash a bootloader. Exact steps may for your particular phone model may be slightly different so be sure to do more troubleshooting about this procedure. Flashing is basically tampering with official software so you may end up messing the phone permanently if not done correctly. Do it at your own risk.


  1. Look for the correct firmware for your phone model and download it. Make sure that you select the right one. It should be the same exact firmware that ran previously on your device. We assume that you list down the firmware version somewhere. If you did not take note of it before, there’s a chance that you may pick the wrong one. As you may know now, using an incorrect firmware can cause complications so good luck with that.
  2. Let’s now say that you have identified the correct firmware. You then want to download it to your computer. The firmware file should have a bunch of files in it like AP_, BL_, CSC_, etc.
  3. Look for the file that starts with a label BL; this should be the corresponding bootloader file for this firmware. Once you’ve identified the bootloader file, copy it to your computer’s desktop or to any other folder that you can easily access.
  4. Proceed with the rest of the flashing procedure using the Odin program.
  5. In Odin, click on the BL tab and make sure to use the bootloader file you’ve identified earlier.
  6. Now, make sure that the “Device Added” status and its “ID:COM box” has turned blue before hitting the START button. This will initiate the flashing of your phone’s bootloader.
  7. Restart the phone once the procedure is finished.

Get further support

As mentioned, flashing a bootloader as a solution is a hit-and-miss. If you are not confident to do it, or if it doesn’t make any difference at all, contact your local Samsung store so they can schedule a repair or replacement for you.