I can't boot into bootloader on Sony Xperia S (unlocked and rooted)

Question

I'm looking to flash another operating system (Ubuntu-touch) onto my xperia S. But in order to do that I need to be in the bootloader. I have already unlocked the bootloader (as evidenced by the ##7378423## menu). I have also rooted my phone, as I thought that might be the fix.

When I reboot my phone into the bootloader (from linux pc using '$ adb reboot-bootloader'), the notification LED lights up in blue, but the screen stays black/off.

Does anyone know what is wrong or what I have to do in order to get the bootloader working?

Thanks in advance for your help! I hope someone has the answer.

Thanks, DevNoob

Answer 1

The Bootloader is working, it does only just not show any screen.

The issue with the flashing however is the command ubuntu-device-flash

According to its Manual this command does only work with Google Nexus devices.

For Sony-devices you can download a port from here and flash it.