Image forming apparatus configured to perform initialization process for first consumable and second consumable attached to main casing in accordance with received instruction

An initialization method of initializing a first consumable memory included in a first consumable and a second consumable memory included in a second consumable,

• the initialization method comprising:
• a reception step, by an image forming apparatus, of receiving an instruction instructing to initialize first lifetime information stored in the first consumable memory of the first consumable attached to a main casing of the image forming apparatus and second lifetime information stored in the second consumable memory of the second consumable attached to the main casing, the first lifetime information being related to a service life of the first consumable, the second lifetime information being related to a service life of the second consumable;
• an initialization step, by the image forming apparatus, of initializing the first lifetime information and the second lifetime information in accordance with the received instruction;
• and
• a write step, by the image forming apparatus, of writing first initialization information in the first consumable memory and of writing second initialization information in the second consumable memory, the first initialization information indicating that the first lifetime information was initialized, the second initialization information indicating that the second lifetime information was initialized.