AT820 Series User Manual
43
ATCOM TECHNOLOGY CO., LIMITED
www.atcom.cn
B.
Received: The recorder of the received calls, maximum 50 items.
C.
Missed: The recorder of the missed calls, maximum 50 items.
6. FAQ & Trouble Shooting
6.1. Frequently Asked Questions
6.1.1. How to make the factory reset
There are two ways to make the factory reset:
A.
Factory reset from keyboard
，
steps are:
1.
Press soft key “MENU”, input right password;
2.
Find and select “Factory Reset” ;
3.
Press “OK”, then the phone will restart automatically and factory reset.
B.
Factory reset through web, please refer to
Reset & Reboot
.
6.1.2 Upgrade firmware under safe mode
If the phone could not start up normally, upgrade firmware under safe mode. Steps are:
1.
Build a TFTP server and set its IP address as 192.168.1.200;
2.
Copy the firmware to the root directory of the TFTP server and modify the file
name as AT820.FW;
3.
Make sure the TFTP server and the phone are contacting with the same switch
and reachable to each other;
4.
Long hold “#” key and start up the phone until the LCD display “Upgrading…”;
