Just for your information. All OS images provided by SinoVoip are affected by a local privileges escalation security flaw that might be remotely exploitable if the board is connected to network/internet: http://forum.armbian.com/index.php/topic/1108-security-alert-for-allwinner-sun8i-h3a83th8/
I informed SinoVoip 3 days ago but as usual they don’t give a shit about fixing things or security in general: https://github.com/BPI-SINOVOIP/BPI-M3-bsp/issues/10