Relocked bootloader can't unlock again - Xperia Arc Q&A, Help & Troubleshooting

I relocked the bootloader according to http://forum.xda-developers.com/showthread.php?t=1134335. Want to unlock it again. I have the key from Sony ericsson. The regular method isn't working. Getting "Failed" in fastboot. How can I unlock it again?

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[Q] Bootloader not working

Hello
whenever I go into the bootloader it says bootloader unlocked, bootloader secureboot and fail in big blue letters. Because of that i cannot install any updates.
I tried unlocking the bootloader but it didn't help.
what can I do?

[Q] How to Unlock after relock

Hello, I'm actually S-ON and I need to apply the firmware update of Mike thread. I was bootloader unlock but to update the firmware I had to relock the bootloader. Now I have to unlock it again, do I have to request again the Unlock.bin file from htcdev or is there some fastboot code?
Either just use the same bin code and fastboot command you used before; or just go through HTCDev.com and request a new code. Either way should work, although some folks have not had luck using the same code, and had to get a new one. While I think others have used the same code again and again.

bootloader unlock question

Hello sir. My device. Htc m9. My device already s-off...... on the boot loader screen how to s-on. & how to boot loader unlock plz sir help
You dont ever need to set s-on and you never need to lock or relock the bootloader. If your bootloader says locked or relocked and you want to unlock it then go to htcdev and follow the online instructions for unlocking the bootloader. You MUST use htcdev as that website will email you a key to flash via fastboot. You need htc_fastboot.exe too.

How to Unlock a Relocked bootloader of HTC One E9 S-OFF

Hi
I managed to "Relock" my Unlocked bootloader of HTC One e9 (please don't ask why ) The phone is S-OFF, rooted with fully working TWRP recovery. How can I unlock the phone again.
I've tried the following with no success :
- command "fastboot oem unlock"
-to flash the Unlock.bin again
-the method from this topic https://forum.xda-developers.com/showthread.php?t=2708571
Do you have any other ideas?
Thank you!
hmm... What about trying to unlock it in the RUU?
I just relocked my phone then unlocked it again with the same Unlock_code.bin and the same instructions from htcdev unlock instruction page 4 in download mode. So yeah, it works.
My phone is S-ON though, but I doubt that it matters.

How to relock bootloader ???

I need relock bootloader and get rid of "Warning Unlocked bootloader "
Or
Is there any way to get off this warning screen
Nobody here .....???????!!!!!!!

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