Hi guys, i have a FSi6S TX. today I tried to update firmware in my TX. after connecting TX with PC and Download firmware in Flysky website. First i give permission in TX firmware updating. then i connected the USB cable to the TX. I choose a firmware file with run as administrator option. After all doing this firmware update page shows me a ready to update. I click the update. After it shows me a erasing all data.. but in 50%. it shows me a update failed. after more tries, I withdraw it. but my TX isnt turn on. Can anyone help me to update the Firmware or Reworking my TX. 
my firmware is 2018 version. 
thanks friends.

Just now i found one thing, TX is connected and disconnected automatically...every 5 seconds in my PC connecting and disconnecting sounds came. So finally disconnecting is the problem i guess. anyone tell me please how to connect the TX properly. i attached  a pic below

Problem solved....