12/8/2022 0 Comments Casio symbolic calculator
#Casio symbolic calculator install#The weird behavior of the installer - giving no option for an install path, and immediately launching an application - made me suspicious that it wasn't actually installing anything. #Casio symbolic calculator update#Running the executable yields an InstallShield installation wizard, which when "installed" (we'll address this soon) produces another window showing the steps that must be taken on the calculator to begin the firmware update procedure. #Casio symbolic calculator zip file#Without the necessary hardware (or patience) for the former, the only remaining option was to investigate the firmware updater.įrom the main web page for the CASIO fx-CP400, a firmware updater ZIP file containing an EXE installer can be downloaded. Two options presented themselves - extract the firmware from the NAND flash chip on the device (a complicated, tedious and error prone process) or reverse engineer the Windows firmware update application. With some initial research completed, the next goal was to get the firmware that runs on the calculator. Without this, hacking the device would have been exponentially harder. The most important resource I found during the research process, though, was CASIO's web page for the fx-CP400 which offered a firmware update tool. (Don't worry if you're confused - I'll discuss these later). But I didn't find much, if any, discussion of the firmware - only one mention of the existence of the 30 resources, and not much else. Though initially exploring the debug menus didn't expose too much new information, their presence was helpful later when decompiling and investigating the firmware. Quickly, I found a forum post with pictures of the internals of the device and revealing some key sequences which could open hidden debugging menus. Researchīefore blindly jumping into reverse engineering the calculator, I made sure to do a bit of research into what others might have already discovered about the device. But that's only half the potential I think this device possesses. #Casio symbolic calculator full#
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