Hello,
Here is what the Texas Instruments Knowledge Base has to say about your question.
I hope it helps.
Reinstalling the OS fot the TI84Plus
Howdo I correct the Error
Waiting...Please Install Calculator SoftwareNowmessage on my TI-83 Plus family or TI-84 Plus family calculator? If an operating system (OS) update fails or is interrupted, the calculator will be in an inoperable state with the message
Waiting...Please install calculator software now.Themost common cause of a transfer being interrupted is updatingthe operating system on a calculator with low batteries. Users will needtouse the TI Connectivity cable and the TI Connect to sendthe operating system to the calculator. Make sure to have thelatest version of
TI Connect installed on the computer.
In order to install the software please follow these steps:
1. Connect the TI Connectivity cable between the computer and the calculator.
2. Click on Start >> Programs >> TI Tools >> TI Connect >> TI OSDownloader
3. Follow the on-screen directions to reinstall the calculator's OS.
If themessage "Error! Press any key to turn unit off. Then turn unit back on."appears on the graphing calculator, quickly, remove one battery from thecalculator and reinstall it while the transfer is taking place.
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