Nextech OBD II Instruction Manual page 6

INSTALLATION:
5. Reset to Factory Settings (Default configuration)
Sending SMS (factory*12345678) to the tracker will delete all user setting
and back to factory configuration and repower on.
Note:
After a factory reset, all IP / APN / internet/ Language / Timezone / Alarm
Setting etc are deleted, just like a new product, all authorized phone
numbers are deleted and password change to 123456, all the alarm settings
are canceled, if the IP/APN/internetname & password are changed, users
need set these again by sending SMS.
6. Working Temperature
The working temperature is -20°C to 60°C, over this range the product may
not function as normal. The storage temperature can reach to -40°C to 80°C.
5