This is a detailed summary from multiple posts.
tkfe is very picky about how its connected via usb
also on tkfe make sure you click on the settings icon and select the available COM port (it becomes available when connected to your phone via USB)
make sure your phone is connected to pc studio by default.
Menu > Settings > Connectivity > Select USB Mode > PC Studio > [ save ]
phone MUST be on the main screen before starting and connecting to tkfe.
1) IF it still wont connect, while phone connected through USB to your computer shut off the phone and turn it back on.
Then try and connect to tkfe again.
IF problem still occurs, you may need to close all running programs/windows on the desktop
then try to connect
IF unable to connect after trying steps above;
may need to restart computer and repeat step 1 while your at it..(TKFE is soo hard to PLEASE!)
IF still unable to connect then your screwed..because i'm now officially stumped.
[ tip ] if your constantly bombarded with phone calls and texts, try enabling airplane mode while using tkfe!