aim: install LineageOS on the phone.
I tried to root the phone using the suggested sony method.
fast boot worked, the connection was given, the result was correct.
still, i had no root rights. so I couldn't go into recovery mode.
adb has the connection to the phone. I am able to reboot the phone with the command "adb reboot recovery" from my computer but doesn't go into recovery mode.
i tried to run "adb root" in the terminal on my ubuntu, didnt work either. so I tried the "adbd insure" app, didn't work because i had no root rights.
then again i tried the sony method of giving me root rights and the result said that it is unnecessary because it is already a rooted phone.
in the "phone info" on the g3311 the option "OEM-unlocking" is grey and unavailable to change.
afterwards i became desprite and switched to windows: tried towelroot, kingo root and oneclickroot. towelroot and oneclickroot said they arent currently supporting the version. kingo root just said that it failed.
How can i access root rights in order to install another operating system on the sony L1?
How can I access the Recovery Mode, other than with the ["press down volume" and boot] or [terminal-wise "adb reboot recovery"] methods?
OS on computer: Dual boot Windows 7 and Ubuntu 14
Android Version: 7.0 (43.0.a.6.49)