XperiaZ1(C6903)

Unofficial ROM

•  https://forum.xda-developers.com/xperia-z1/development/rom-lineageos-14-1-unofficial-t3546710

Official ROM

•  http://storagecow.eu/index.php?dir=Xda%2FSony%2FXperia+Z1%2FC6903%2F

Bootloader Unlock

•  https://developer.sonymobile.com/unlockbootloader/