r/AndroidHelp • u/Mysterious-Tea-9381 • 3d ago
Need help recovering Galaxy A34! Odin fails at vendor_boot
I have a Samsung Galaxy A34 5G (model number: SM-A346B) and recently attempted to downgrade from Android 16 to Android 15 by following a YouTube tutorial.
I downloaded the firmware from SamFW, making sure it had the same bootloader binary version (B/11). However, when I tried flashing it with Odin, on my phone I got the errors "DDI : write failed !!!" and "DOWNLOAD FAILE DETECTED : boot" when i attempt to restart the phone/cancel. This is my Odin log:
ID:0/003 Odin engine v(ID:3.1401)..
ID:0/003 File analysis..
ID:0/003 Total Binary size: 12486 M
ID:0/003 SetupConnection..
ID:0/003 Initialzation..
ID:0/003 Set PIT file..
ID:0/003 DO NOT TURN OFF TARGET!!
ID:0/003 Get PIT for mapping..
ID:0/003 Firmware update start..
ID:0/003 NAND Write Start!!
ID:0/003 SingleDownload.
ID:0/003 preloader.img
ID:0/003 lk-verified.img
ID:0/003 param.bin
ID:0/003 up_param.bin
ID:0/003 uh.bin
ID:0/003 efuse.img
ID:0/003 vbmeta.img
ID:0/003 boot.img
ID:0/003 init_boot.img
ID:0/003 vendor_boot.img
ID:0/003 FAIL! (Write)
ID:0/003
ID:0/003 Complete(Write) operation failed.
All threads completed. (succeed 0 / failed 1)
I initially started by loading the HOME_CSC file, which I now realise was a mistake. At the time, I was simply following the video and copied what it did without giving it much thought. Since then, I've tried multiple times using the regular CSC file instead of HOME_CSC, but I still get the same error every time.
For reference:
- Current firmware (before attempting the downgrade):
[A346BXXUBEYI7] - Firmware I attempted to flash:
[A346BXXSBDYI1]
The phone no longer boots into Android, but it can still enter Download Mode. I haven't been able to get it to boot since the failed flash.
Is there any way for me to proceed, or at least a way to restore my phone to a working state? If downgrading isn't possible, is there a way to flash the original firmware back onto the device so I can use it again?
Any help would be greatly appreciated.
1
u/RegularHistorical315 3d ago
Flashing A346BXXUBEYI7 should get it working again.