This instruction list grow from XDA member @Raphos instructions here and their, @MartinX3 and others' posts throughout that thread as well as documentation found at ix5.org
Use one of the flash modes
- flashmode (VOL_DOWN) #green - is used by flashtool to flash the Sony Software - press volume down and insert the USB cable (green light will come)
- fastboot (VOL_UP) #blue - is used by fastboot to flash the AOSP images - press volume up and insert the USB cable (blue light will come)