Tu n'as pas assez lu la doc Kevin. Le tout premier paragraphe de la page consacrée aux nouveaux utilisateurs est :

Installation

You must first install FlashAppy on your calculator. Note that like all ROM patches, you will not be able to send your modified calculator ROM image to other calculators. Neither the authors of GTC nor the author of FlashAppy can be held responsible for any damage that could occur during or after this process. However, we are not aware of any case where a calculator was damaged by FlashAppy. You only need to install FlashAppy once: you won't need to reinstall it after a reset or after upgrading to a newer version of GTC. On the other hand if you install an AMS update you will need to reinstall FlashAppy afterwards.