PROVISIONING OF A XUICC WITH AN OPERATING SYSTEM AND DATA AND PROGRAMS

1. A method for provisioning an xUICC, destined to host one or more profiles for communication in a mobile communication network, comprising the steps:E1) Providing in the xUICC an OS load key, as a root of trust (RoT);E2) Loading and installing to the xUICC an xUICC operating system, xUICC OS, encrypted with the OS load key for the loading, the xUICC OS being designed to enable directly or indirectly receiving and installing in the xUICC one or several eSIM profiles;E3) Loading and storing to the xUICC xUICC unique data, encrypted with the OS load key for the loading, the xUICC unique data comprising at least one GSMA certificate, certifying the xUICC with the installed xUICC as certified for receiving and installing in the xUICC eSIM profiles;E4)∗ preparing the xUICC for a later downloading and installing step E4) of downloading and installing an eSIM profile, encrypted with the OS load key for the downloading, to the xUICC prepared with steps E1-E3,characterized in that the xUICC operating system, xUICC, of step E2), the xUICC unique data of step E3), and the eSIM profiles of step E4) are encrypted with the same OS load key provided in step E1).