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AirCard USB Modem User Guide
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Modem is not detected after AirCard Watcher 
installation completes (Windows)
You successfully complete the automatic installation process, but Watcher does 
not detect the AirCard USB Modem:
1.
Click 
Start
, and then click 
Control Panel
.
2.
Double-click 
TRU-Install
.
3.
When you are prompted to switch to modem mode, click 
OK
.
4.
Wait for Watcher to detect the AirCard USB Modem.
5.
If the AirCard USB Modem still is not detected, connect to the Internet using 
another method and go to 
 for assistance.
Windows installer fails
When you try to install or uninstall Watcher, the message 
Windows Installer is not 
accessible
 (Error code: 1601) appears.
To fix Error 1601, first see if another installation process is running.
1.
Press 
Ctrl + Alt + Del
 and select Task Manager.
2.
Go to the 
Processes
 tab.
3.
Check the running processes for any of these names:
· setup.exe
· isetup.exe
· ikernel.exe
· msiexec.exe
· idriver.exe
· IsUninst.exe
· Uninst.exe
If any of these processes are running on the system:
1.
Select each process.
2.
Click 
End Process
.
3.
Try to run the Watcher installation again.
If the installation is not successful, connect to the Internet using another method 
and check Sierra Wireless Knowledge Base articles at