Welltech VoIP ATA series V.2.1 - Manual (Page 150)

ATA-171/172/171P/171M/171+/172+
User’s Guide
(Figure 3)
Step 3: The system will check with the server, if the file existing or not. (E.g.:
Firmware File Prefix+_ver.dat). If existing, it will check the [Version]
column, if the version is newer than the current version, update will
execute.
Step 4: Put TA1S_ver.dat and new update version information (e.g.:
TA1S_0609100.gz) to [TFTP or FTP or HTTP Server] indicate address.
12.2.5 NOTICE
 (Phone)
[Found new s/w] will be found on LCD，please select [Menu] -- [7.
Administrator 2. Upgrade System1. Upgrade Now 1. Yes] , then
update.
 (FXS/FXO)
When pick up the phone, DoDoDo will be heard. Please input ”#190#” then
hang up the phone, pick up the phone again, and input “#190#” to execute
update.
NOTICE: It takes 2~3 min to update, during the time period, dialing
function cannot work, please don’t move the power supply.