I pulled out the SD card of the Pi2 and inserted it in a Linux Mint installation. Under 1 of the 4 partitions on the SD-card I found the configuration.yaml file. It looks like a virgin… brand new 
Blockquotehomeassistant:
#Name of the location where Home Assistant is running
name: Home
#Location required to calculate the time the sun rises and sets
latitude: 52.4592
longitude: 4.6119
#Impacts weather/sunrise data (altitude above sea level in meters)
elevation: 0
#metric for Metric, imperial for Imperial
unit_system: metric
#Pick yours from here: List of tz database time zones - Wikipedia
time_zone: Europe/Amsterdam
#Customization file
customize: !include customize.yaml
#Configure a default setup of Home Assistant (frontend, api, etc)
default_config:
#Show the introduction message on startup.
introduction:
#Uncomment this if you are using SSL/TLS, running in Docker container, etc.
#http:
#base_url: example.duckdns.org:8123
#Discover some devices automatically
discovery:
#Sensors
sensor:
weather prediction
-platform: yr
#Text to speech
tts:
-platform: google
group: !include groups.yaml
automation: !include automations.yaml
script: !include scripts.yaml
It looks like it is write protected 
