Constantly in reboot loop

Ryan needs help

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Oct 24, 2020
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Yesterday I decided preform a flash on my Galaxy S9+ using oldin. It is because OEM lock appeared. However, i have accidentally unplug it during the process. A blue screen with " An error has occurred while updating the device software. Use the emergency recovery function in the smart switch PC software". This wasn't the only issue. It was since stuck in a constant reboot loop that I can't seem to exit no matter what I do.

When it is not plugged into any power, it will not start or anything. However, when it is plugged in, the blue screen flashes out for a quarter or a second and reboots over and over again.

I tried booting it into safe mode and recovery mode, but i cant get far with only a quarter of second each time. Sometimes has a split second scenario which looks like it's loading the recovery mode menu, where the "Installing system update" screen appears for a quarter of a second, then followed by an error screen for another quarter of a second. It never reaches the menu however, as the screen goes black afterwards, and resumes the bootloop issue once more.

I could not access the download mode as the time is too short for me to flash anything.

Any idea what I can do to fix this?
 

mustang7757

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Hi, welcome to AC!

How far were you in the update before you disconnected?

While the phones off and restart in download mode before u plug into computer will it stay?
 

Ryan needs help

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It stayed in download mode before i plug into the computer, the only thing is that its in "custom binary blocked by OEM lock" Hence, that's why I decided to flash my phone. I accidentally unplugged it during the flash. i Flashed the BL and AP before its disconnected.
 

mustang7757

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It stayed in download mode before i plug into the computer, the only thing is that its in "custom binary blocked by OEM lock" Hence, that's why I decided to flash my phone. I accidentally unplugged it during the flash. i Flashed the BL and AP before its disconnected.
Can you post screen shots?

In download mode it tells you this message?
 

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