![]() Save the file on the desktop of your computer. As of the publication of this article, the current version is 2.55. Visit the TI-84 Plus download page and download the TI-84 Plus family Operating System. The first step to updating your Texas Instruments calculator is to download the operating system file. Step 1: Download OS from Texas Instruments Website It takes about 5 minutes and requires a mini USB cable and a computer running Windows or Mac OS X. I figured out how to do it on my own and now I bring you this guide. The problem, however, is that I couldn’t find a simple guide on the Internet to show me how. ![]() I then decided that I needed to update the operating system on my calculator. ![]() I never realized that it mattered which version of the operating system my calculator was running until we started doing logarithms in College Algebra class I needed to do calculus homework and my calculator was missing the change of base formula (logBASE) that’s found under the MATH menu on the TI-84 Plus calculator. I have an older-model Texas Instruments TI-84 Plus calculator that was running the operating system that Texas Instruments loaded on it a few years ago.
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