Answered: Program Wiping Off and Not Downloading

About a week ago, we were at competition with our Vex robot. At the end of the competition, I took the Vex bot to the practice field to test the program and then brought it, almost immediately, to the playing field. I put it on the playing field and the yellow program light (not the green one) was not turning on (generally, this light turns on when I turn the robot on); from what I could seen, the program had been spontaneously wiped off the robot.

I had been having that problem with the robot for the next couple of days (where programs would get spontaneously erased from it). As of two days ago, I cannot even download programs onto my robot. Whenever I try to download, it fluctuates between “COM port open” and “No connection” for a few seconds, and then tells me to check my power supply and connection. I am using a fully charged battery, and I’m quite sure that the USB connection is strong. In addition, I have tried downloading a wide variety of codes onto the bot, from codes I have used in the past (including an RC code), to the default and master codes, to simple programs that turn one motor on. None of them work.

I read another post saying that this problem could be solved by letting the computer sit overnight and trying again; this did not work for me.

Basically, now I have a robot with no code on it whatsoever. The green power light and the green program status light (next to the power light) are both on, but that’s it. Sometimes, when I try to download programs, the motors turn on and off inexplicably; other than that, it does nothing!

Does anyone know what could be going wrong here, with the robot not being able to download programs and wiping them off spontaneously?

Thank you so much!!

**If the PRGM STATUS is “On”, the unit is locked in a “Download Mode”. To correct this issue, you must download both the Master Code then the Default code.

Please refer to the post “Programming light is always on” on our Forum at for help on correcting this issue.

This mode can be entered if the programming cable is disconnected before the downloading of code has finished.**