I just updated the firmware on my WTIU without any problems. Below is a comprehensive overview of the process:
I checked the current version of the Firmware from both the DCS App and the LuCi web interface:
DCS APP: I also attempted to update the firmware through the app and it said the WTIU was up to date.
Luci Web interface:
In the LuCi Web interface, Click on the "System" drop-down menu and click on "Backup / Flash Firmware"
Now click on "Flash image..."
Click on browse, select the location and downloaded file from the MTH website:
Click the "Upload" button:
You'll receive a status bar showing the upload (this will go fast):
You'll receive this confirmation box. Don't change any of the options selected or unselected and click on "Continue":
now this notice will pop up briefly but heed its warning. (I wish it would stay up longer):
At this point my WTIU rebooted and my browser took me back to the LuCi homepage. It was obviously not showing correct data as the device was still rebooting:
I waited a FULL TWO MINUTES (be patient here or you could become the owner of the new WTIU PAPER WEIGHT).
Eventually, my browser did pop up this message over the LuCi homepage, Click the "Log in..." button:
After logging into the LuCi web interface again I checked the firmware version:
DCS APP:
LuCi Web Interface:
UPDATE HAS BEEN SUCCESSFUL!!!