Database Develop

Help: I can't access the bootloader on Z3c

Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).

die_braut said:
Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).
Click to expand...
Click to collapse
1. Check if bootloader unlock allowed = yes, (open dialer, enter *#*#7378423#*#* and go to service info-configuration).
2. If yes, unlock bootloader - https://developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader (backup ta if you want - https://forum.xda-developers.com/cr...versal-dirtycow-based-ta-backup-t3514236/amp/)
3. Flash recovery: install official TWRP app, select recovery for Z3c, download and flash on computer with terminal command 'fastboot flash recovery'.

I confirm the same issue as OP. I've downloaded the respective firmware and have confirmed via the service page that the bootloader is unlocked.
Now I'm trying to boot into fastboot via "adb reboot bootloader" and my phone looks like it turns off (no notification lights). When I type "adb devices" and "fastboot devices" both are blank ("adb devices" could find the device prior to the reboot command).
I also tried the Sony instructions and pressing Vol Up + Plugging in USB and this also has the same result as above. Not sure what to do next.
Update: I'm using Windows 10 and the problem was that it would not install the unsigned drivers that came with Flashtool. Once I rebooted Windows in troubleshooting mode (Shift + Restart) and disabled the signed driver requirement, Flashtool installed correctly. I reflashed the phone for good measure and now following the normal steps fastboot devices picks up the phone.

Need help to relock the Razer Phone 2 bootloader.

Hi, Im kinda new to this bootloader thingy. What happen is, i updated the razer phone 2 to Pie, but notice wifi and sim card cant be detect. Even factory reset fails. So i thought of flashing new image on it. KINDA easy on my oneplus, but im not sure where I gone wrong on this razer phone 2, i accidentally unlock the bootloader. NOW the problem is HOW to relock it back? i been follow all youtube and guides all over the place but still fails.
The state of device atm, cannot be boot into Download Mode. Everytime I plug in usb c from Windows, it will boot into unlock bootloader warning page, and continue boot into the homescreen. testing the adbtools, fastboot also to no avail. Can anyone help and guide me how to relocking it back? Maybe i type wrongly on cmd or maybe other android steps not similar to razer one etc....:crying:help much appreciated.

Hold volume down while turning on. Then fastboot flashing lock.

the stock usb doesnt send things correctly in BL mode, https://www.amazon.com/Blackweb-3-Foot-Charge-Cable-Connector/dp/B07SG7P3KZ/ worked for me. with the correct usb cable you should be able to perform the lock commands correctly. can you give us more detail of what you tried on this phone so we know if we need to provide you additional information?

https://developer.razer.com/razer-phone-dev-tools/general-instructions/
"Locking the Bootloader
Locking the bootloader is recommended for security reasons. Some applications will not work with an unlocked bootloader.
Start the Phone in Download Mode with one of the following methods:
Using the adb tool: With the Phone powered on, execute: adb reboot bootloader Enter Download Mode:
Plug in a USB cable to connect your Razer Phone to your computer, Power Off the Phone, then turn it on and immediately press and hold the Volume Down button until “Download Mode” appears on screen.
Lock the critical partitions of the Bootloader first by running this command: fastboot flashing lock_critical
Your Razer Phone will show you a confirmation screen. Use the Volume Up/Volume Down buttons for navigation, and press the Power button to select. Your Phone will reboot."

I can't seem to enter download mode. All I have is fastboot mode and the option to either reboot, close the phone or enter recovery mode. I would really like to lock the bootloader, but I can't seem to be able to detect my phone on my PC even though I installed the fastboot driver.

The_Vinlander said:
I can't seem to enter download mode. All I have is fastboot mode and the option to either reboot, close the phone or enter recovery mode. I would really like to lock the bootloader, but I can't seem to be able to detect my phone on my PC even though I installed the fastboot driver.
Click to expand...
Click to collapse
You must use a USB 2.0 port. The RP2 isn't detected by fastboot when connected to a 3/3.1 port.

Reznor7 said:
You must use a USB 2.0 port. The RP2 isn't detected by fastboot when connected to a 3/3.1 port.
Click to expand...
Click to collapse
I tried this, but to no avail. I tried with 2 cables I had and it keeps telling me < waiting for device > when I enter this command; fastboot flashing lock_critical

The_Vinlander said:
I tried this, but to no avail. I tried with 2 cables I had and it keeps telling me < waiting for device > when I enter this command; fastboot flashing lock_critical
Click to expand...
Click to collapse
You need to go into your device manager and select [ android bootloader interface ] while in fastboot

dm-verity corruption Oppo Reno 3

So after unlocking my Reno 3 bootloader with Unofficial way (with mtkclient ) i have this message when phone is booting "dm-verity corruption
Your device is unlocked and can't be trusted to continue press the power button "
And the phone is working fine and bootloader status in " developer option ==> oem unlock " is UNLOCKED
the problem here is I can't access fastboot mode or recovery mode but i can enter EDL or BROM mode.
So the question is there is anyway to access fastboot?
Ps : i tried adb command
" Adb reboot bootloader & adb reboot fastboot "
But the phone reboots to normal
2- When i press volume - & power the phone keeps vibrating like he is rebooting again and again
NOTE that i remove my hand off the power button after the first vibration.

Same problem

How do I Enter fastboot mode after OEM unlocking

Hello
I have a clean untouched redmi9 MIUI global 12.5.5 android 11
I have not even used it before.
I tried to enter fastboot mode by enabling developer options oem unlocking
also USB debugging on
Then I power off and I press volume down + power key
Phone just vibrates and restarts does not enter fastboot. If I quickly remove hands while vibrating it gets stuck on vibrating until i hard press power again. I can never enter fastboot mode even though I tried a lot of times. I downloaded the ADB tools and used .\adb.exe reboot bootloader. Phone vibrates for around 6-7s then restarts.
How do I enter fastboot mode it should not be this hard!

Hi
You are using the wrong command
type
adb reboot bootloder

Question how can i lock my bootloader

I use rescue and smart assistant to rescue my device but the bootloader is unlocked can you help me to lock it

What I did is the following: I used Rescue and Smart Assistant to flash the latest software. The device rebooted. I shut it down, and booted back into fastboot. Then I gave the command "fastboot oem lock", and I got a screen asking if I want to lock the bootloader or not. Using the volume key you select "yes" and you verify pressing the power button. That work fine for me!