**Android Phone System Command**

a) Fastboot unlock
<code bash>
adb devices
adb reboot bootloader
fastboot oem unlock
fastboot reboot-bootloader
</code>

b) Update the whole android system
<code bash>
adb reboot bootloader
fastboot flash bootloader [bootloader file].img
fastboot reboot-bootloader

fastboot flash radio [radio file].img
fastboot reboot-bootloader

fastboot flash recovery [recovery file].img
fastboot flash boot [boot file].img
fastboot flash system [system file].img
</code>

c) Flash the whole system, Update all with Flash-all (Nexus)
<code bash>
fastboot -w update [image file].zip
</code>

d) Flash Recovery Imag TWRP, https://twrp.me/Devices/
<code bash>
fastboot flash recovery twrp.img 
</code>

e) Flash Supersu.zip with TWRP boot to make android rooted

Stable version of SuperSU https://download.chainfire.eu/696/SuperSU/UPDATE-SuperSU-v2.46.zip \\
Beta version of SuperSU https://download.chainfire.eu/740/supersu

<code bash>
adb push Desktop/SuperSu.zip /sdcard/
adb reboot recovery
</code>

f) Mount the android image on Linux
<code bash>
mount -t ext2 -o loop userdata.img /mnt/userdata
</code>