Galaxy S20+ Boot Loop

[DatC0de]

Hey guys,

Unfortunately for me, this morning, my Galaxy S20+ decided to brick itself, without any apparent reason.

What happened:
I took my phone, I opened a banking app, my phone restarted (such a thing never happened before).
After it restarted, everything seemed normal. I opened a different app, this time the phone restarted, but entered a boot loop.

Everything about the software is stock Samsung, nothing has been tinkered with. I have not even installed an app in the past months or done any manual updates.

What I've already tried:
Force Restart (pressing power button and volume-down button simultaneously) --> Restarts, then Boot Loop
Secure Boot (pressing power button first and then holding volume-down button, as soon as Logo appears) --> Did not work, restarts, then Boot Loop
Wiping Cache from Recovery Mode (power + vol. up, then wipe cache) --> cache did wipe, still Boot Loop after restart
Enter Bootloader from Recovery Mode, while connected to PC via USB (just for fun I guess?) --> Stuck at "Entering Fastboot Mode", needed to force-restart

What I want to avoid for now, is a factory reset, as I want to at least try to save the data from my phone. Did not do a backup unfortunately, lesson learned...
The phone appears to be charging. When its not bootlooping it seems to be charging from my PC and charging brick, and the battery percentage is steady over the hours.

I've read something online about Samsung Apps, which can cause bootloops when updated. Don't know if this is the case here.

Maybe you guys have some tips or tricks, maybe I'm missing something. Any help or advice would be greatly appreciated!

[USflatliner]

Hi @DatC0de ✌️ Try the following key combination.

Press and hold the volume up + volume down + power button at the same time until your smartphone starts.

This key combination will briefly disconnect the battery from the system.

[DatC0de]

Just tried it. When I keep holding the buttons, the phone has a "faster" bootloop (Logo appears and disappears every 5 seconds). When I let go of the buttons as soon as the Logo appears, it starts a "normal" slow bootloop again. Didn't work sadly. Thanks nontheless.

[USflatliner]

Too bad, it would have been an option. I would have been happy to help. I can't think of anything else at the moment.🧐✌️

[USflatliner]

Do you have the option of connecting your smartphone to a PC using a USB cable? If so, you could try starting an emergency recovery using the SmartSwitch software PC. You can find out how this works in the video here.

https://youtu.be/9QhJngOuLQ4?si=wSAEcyV91YbY637j

Download here...

https://www.samsung.com/de/apps/smart-switch/

[Maxili]

Buy New Phone 🙏

[DatC0de]

lmao

[DatC0de]

Doesn't this option include wiping your phone? I want to try to avoid that. I have the option to factory reset it in the Recovery Menu.

[USflatliner]

Yes, during this emergency recovery SmartSwitch reloads the operating system completely from the Samsung server and all personal data and settings are lost. It is actually equivalent to a factory reset in recovery mode.

[Members_77g9OEf]

I had the same problem and then replaced the battery as it only lasted a few hours.

Didn't help. Then I thought it was all garbage anyway, I'd try baking my motherboard.

And lo and behold, I brought it back to life.

I carefully loosened the back panel with a hot air gun,

then I removed all the connections to the motherboard at the top.

I unplugged the cameras so that I only had the bare circuit board.

Then I placed the motherboard on baking paper on the baking tray in the oven and heated it to 135 °C. When the oven reached 135 °C, I left the board in for 30 minutes. (This is how I used to repair graphics cards with cold solder joints) Then I switched the oven off and left everything in until the oven had cooled down. Then I put everything back together and the boot loop was gone. The new battery now charges for at least 2 days again. The phone is like new.

Try it out, you can't break anything anyway.

The whole thing was done 2 weeks ago and the phone still works perfectly today.

Transl. with DeepL.com (free version)