Question Rooted phone enable bootloader can't exit security error - Samsung Galaxy A12

Hi guys,
I rooted my phone successfully, then I wanted to unroot and before flashing factory from I enable bootloader and now the phone screen is
Security error: This phone has been flashed with unauthorized software & is locked. Call your mobile operator...
And at the top of the screen, there is
Only official released binaries are allowed to be flashed : vbmeta
I try to enter in download mode volume + volume - USB cable and nothing.
I can't exit this screen to flash factory rom.
Any idea how to exit the screen?
I appreciate your help.
Thanks

Make sure yu force reboot your phone then swith to download mode fast to enable download mode

Fixed, needed to move the USB cable to the PC from USB 3.0 to USB 2.0 and it worked, I was able to switch to download mode.

Related

Recovery boots to system software not authorized by VW

The phone doesn't have volume buttons so I decided to root it with Towelroot and install a 4 way reboot for recovery . Now every time I try to boot it starts with recovery booting in blue then secure fail: kernel system software not authorized by Verizon Wireless... . The phone is in 4.4.2 and can't go into adb or Odin as I can't get it in download mode. Is there a fix for this or am I completely screwed ?
xTheLover said:
The phone doesn't have volume buttons so I decided to root it with Towelroot and install a 4 way reboot for recovery . Now every time I try to boot it starts with recovery booting in blue then secure fail: kernel system software not authorized by Verizon Wireless... . The phone is in 4.4.2 and can't go into adb or Odin as I can't get it in download mode. Is there a fix for this or am I completely screwed ?
Click to expand...
Click to collapse
I also face the same problem when i install TWRP 2.8.7.0 using Flashify.
With the phone powered off, press simultaneously volume down, home and power button to get into download mode. On the screen offering option to Volume Up to continue and Volume Down to cancel, press Volume Down and the phone will restart and you can use it.
The link to this forum is given below:
http://forums.androidcentral.com/ve...my-phone-hard-bricked-no-chance-recovery.html
can't get into download mode as volume buttons are broken, is there a way to boot into download mode without volume buttons on the error screen?
xTheLover said:
can't get into download mode as volume buttons are broken, is there a way to boot into download mode without volume buttons on the error screen?
Click to expand...
Click to collapse
If you are familiar with adb, and you have it installed on your computer, you can use it to boot into download mode with this command:
Code:
adb reboot download
For more information check here: http://forum.xda-developers.com/showthread.php?t=872128
Thanks for the replies but my S3 doesn't show up when I type adb devices and Odin doesn't recognize the phone as well. I have the Samsung drivers and have USB debugging checked before all. How can I get my PC to see my s3?
xTheLover said:
Thanks for the replies but my S3 doesn't show up when I type adb devices and Odin doesn't recognize the phone as well. I have the Samsung drivers and have USB debugging checked before all. How can I get my PC to see my s3?
Click to expand...
Click to collapse
While your phone is connected to the PC check Device Manager and see if there are error icons ( yellow triangle with ! ) relating to your device. I won't be able to help much with that, I haven't used Windows in almost a decade.

Soft brick cannot enter either recovery or bootloader mode. Advice needed.

I formatted data and flashed Quantum Stock ROM (did not flash "RMM bypass zip"). After starting the phone once I tried to install a GSI (Treble) ROM. Disaster.
The phone is softbricked(?).
1. If connected to power source or PC the phone keeps restarting.
2. If no cable is attached, after powering on it shows logo and then switches off.
3. Cable connected or not connected, no matter which combination of buttons I press I just CANNOT enter recovery or bootloader mode.
Please advice on how to proceed. Thank you. :fingers-crossed:
Solution:
When the phone is powered off, hold VOL UP + VOL DOWN and insert the usb cable that is connected to a PC.
A screen will appear giving option to enter "download mode" by pression VOL UP. Do it.
Now the phone is in download mode.
Use ODIN to flash the latest firmware.
English is not my first language
I'm with the same issue!! I already flash the latest firmware but doesn't worked.

I Do Not Have Access To Download Mode Galaxy a30s

Hello everyone! the problem is on the galaxy a30s
1.- I can enable the developer options, when I try to enable it gives me a message that the developer options were enabled but the section does not appear!
2.- at the time of wanting to enter in the download mode with the keys while, cell phone off, volume + - and connect usb type c to the computer only charging appears on the screen.
3.-In another attempt to enter in the download mode, i use the recovery options and select the download mode, the phone restarts in the system and not in download mode.
4.- already tried to restore to factory mode from the recobery but it tells me that mdm does not allow it and the phone is restarted in the system, I have my account registered in the phone, does not allow me to factory reset or encrypt the phone, when I select it encrypt appears enabled but then it is automatically disabled
Any suggestion will be welcome, already try disconnecting the battery vol + - and connecting the cable, but do not enter the download mode either, any option to use jig mode?
thanks for your time and regards.
To boot into Download Mode boot into Recovery Mode. And select Bootloader

No option to unlock bootloader?

I want to root my phone with Magisk, so, following the instructions here:
I enabled OEM unlocking on my SM-A516B (European, not US or Canada and it's running the latest offical software (Android 12)) and rebooted to download mode via adb (goes to a "fastboot" mode when I select bootloader mode from recovery mode), but I don't see any option to unlock the bootloader. The English text on the screen says only:
Code:
Downloading...
Do not turn off target
Do not disconnect the USB cable during the software update!
Volume Down Key + Side key for more than 7 secs
:Cancel (restart phone)
There is also some Korean text, a DID code and a barcode. Holding volume up does nothing.
I'd seriously appreciate any ideas on how to proceed!
So I found the solution for myself: I don't want to go to the download mode, but instead hold valume + and - and plug in a USB cable.

Need help with KNOX removal

I have a Samsung A51 with MDM lock & passcode lock. Andriod Version 10.
Device cannot enter download mode, cannot reboot to bootloader, cannot factory reset also.
How do I remove the MDM lock on this device, or is there a way I can force this device to download mode?
To force download mode:
Power device off completely with no cables connected
Plug a USB cable into your PC, do not yet connect your phone
Hold both Volume + and - buttons, do NOT press Power, and while holding them plug in the USB cable
Device should start with a prompt, follow the instructions to enter download mode

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