Upgrading the Operating System erases the RAM memory from the calculator.This means that any programs (games) that reside under the PRGM button will be lost unless they are archived before you begin.If an asterisk is already present, this process will remove it (unarchive). There may be, however, that ONE student who interrupts the transfer by fiddling with the calculator or whose calculator simply is not cooperating. If you have a newer version of the TI-Connect software (1.5.3 or higher), then simply do the following: 1. *NOTE: After clicking on Device Explorer the error message "Cannot establish a valid connection" will appear.Be sure all programs have an asterisk before continuing. connect the calculator via cable to your computer 2. Ignore this message and continue Now drag the OS file into the Device Explorer window.The old OS was deleted (wanted to install an older one) but then it always failed to validate the new ones... Already tried with numerous versions of the OS both from other TIs and from computer (using different software)But for me that hasn't changed anything. Update: It didn't install but ON mode did work.
Linux users, please ensure that you are running the latest version of Ti LP (you may have to compile it yourself).
As new applications and accessories are developed by Texas Instruments, operating system updates are posted at their website.
These new operating systems can be downloaded from the website or transferred from one calculator to another.
Additionally, note that installing Knight OS will erase your RAM and TI-OS Archive. Texas Instruments has put measures in place to prevent users from upgrading the operating system on their calculators, starting with boot code 1.03. TI-84 Color Silver Edition users do not need to follow these steps unless they have trouble without, thanks to another exploit from Brandon W that allows us to circumvent the validation without a complex procedure.
Knight OS has no math or graphing support past a simple 4-operation calculator.