Softbricked SM-G955U | Need Help

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Apr 5, 2018 5:08:47 AM via Website

Let me start this by stating what I know.

The model no is SM-G955U
Carrier is US Cellular
I am using the OEM cable
I do not have the serial number
I cannot unlock the bootloader.
USB Debuggin is enabled.

I tried rooting the phone a while back, I can't remember what tutorial/rom.
I ended up softbricking it then, I just used ODIN to flash the stock firmware, and it fixed itself.

I was trying to use this tutorial:
[V2][Update][Root][G955U]PartCyborgRom - SamFail Rooted/Debloated/Audio/More
(Can't post link because I am a new user"

To root the phone.
I was following the tutorial to the T, USB 2.0, AP first. It failed, without saying "Unknown error", I tried redoing it. Same thing.

I downloaded the stock firmware to fix it, and it still failed.

Now I get a blue screen with a cautionary symbol, and the words:

"An error has occurred while updating the device software. Use the Emergency recovery function in the Smart Switch PC software."

I tried this method, however, I do not have the serial number, so I cannot use this method.

I am running out of ideas, and I need my phone back soon. Any suggestions will help.

This is what Odin3 v3.12 says:

Added!!
Enter CS for MD5..
Check MD5.. Do not unplug the cable..
Please wait..
Checking MD5 finished Sucessfully..
Leave CS..
Odin engine v(ID:3.1203)..
File analysis..
SetupConnection..
Initialzation..
Erase...
Get PIT for mapping..
Firmware update start..
SingleDownload.
system.img.ext4
FAIL! (Auth)

Complete(Write) operation failed.
All threads completed. (succeed 0 / failed 1)

— modified on Apr 5, 2018 5:33:09 AM

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  • Forum posts: 1,136

Apr 5, 2018 6:28:39 AM via Website

First of all, try to download the Stock ROM from SamMobile here https://www.sammobile.com/firmwares/galaxy-s8-plus/SM-G955U/ and reinstall it using Odin.
But if it doesn't work, try to install TWRP and use it to wipe your system and then access the download mode to reinstall the Stock ROM.
I think this way is gonna work.

AC&MM
Moto X Force
Galaxy Tab 4 8.0
Nokia 3310

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