Method for operating control device executing plurality of applications

The invention relates to a method (100) for operating a control device (1) on which a plurality of applications (2, 3, 4) are executed, comprising the following steps: obtaining (110) a first code block (21) of a first application (2), which contains executable program code of the application (2), on the basis of a reference (1a) fixedly stored in the control device (1); checking (120), on the basis of verification information (1b) fixedly stored in the control device (1), whether the first code block (21) is in a state corresponding to the verification information (1b); in response to the result of the checking being positive, releasing (130) the program code contained in said first code block (21) for execution; obtaining (140) a pass block (23) comprising a reference (23a) to a further code block (31, 41) of a further application (3, 4) on the basis of at least the reference (21a) contained in the first code block (21), wherein the further code block (31, 41) comprises executable program code of the furthe