Education Technology

Solution 11141: Re-Establishing a Connection Using the Black TI Connectivity Standard Mini-A To Mini-B USB Cable After the TI-84 Plus Family Calculator Failed to Upgrade the OS.

Why can't a connection be re-established using a black TI Connectivity Standard Mini-A to Mini-B USB cable after the TI-84 Plus family calculator failed to upgrade the OS?

If the error message "Cannot establish communication" appears after an OS transfer failed, the calculator may no longer have a usable OS installed. The OS transfer may have failed because of dead batteries in the device, the cable was inadvertently disconnected and/or PC processor-intense activities were running during the OS transfer. At this point, the calculator will rely solely on the device boot code to operate and communicate with the PC.

The black TI Connectivity Standard Mini-A to Mini-B USB cable must be plugged in after the boot code screen (i.e. "Waiting...Please install calc software now") is initialized.

To re-establish a connection between the PC and TI-84 Plus family calculator, try the following:

• Unplug USB cable.
• Turn the TI-84 Plus family calculator OFF (by removing one battery).
• Re-insert the battery and turn device ON (by pressing [ON]).
• Plug the USB cable into the device.
• Start the OS download within the next 50 seconds.

Windows® may report an attached USB device has malfunctioned. If the unit goes to the error screen (Press any key to turn unit off. Then turn unit back on) before the transfer starts, try the steps above again.

If the device has a corrupted OS (i.e. won't power on with good batteries), it may take a few extra steps to get to the boot code screen. Try the following procedure:

• Hold down the [DEL] key.
• Remove any AAA battery Wait a few seconds.
• Reinsert the battery.
• Release the [DEL] key.

The unit should now display the boot code screen.