Why do apps need to be signed
Welcome to TI|BD konakarthik12! Mandatory info spiel: Please refrain from posting the same question in multiple places and from replying to very old posts. You may want to introduce yourself.
Apps don't inherently need to be signed, but TI wants to prevent people from releasing apps that could potentially damage the reputation of their calculators. App signing also helps to prevent people who don't know what they're doing from releasing buggy apps that could potentially erase or otherwise damage the calculator.