Software update apparatus, software update method, non-transitory storage medium storing program, vehicle, and ota master

A method of updating software comprising:

• controlling a computer that includes a storage and a processor so as to:
• generate a request for downloading update data from a center;
• receive and store the downloaded update data in the storage;
• execute, based on the update data, a control for installing, or installing and activating, updated software on at least one target electronic control unit from among a plurality of electronic control units connected to each other via an in-vehicle network;
• acquire, in response to execution of a first control for installing, or a second control for installing and activating updated software, software versions of the electronic control units;
• confirm that there is consistency in a combination of software versions before the first control or second control is executed in some electronic control units of the plurality of electronic control units that, after the first control or second control was executed, have been determined to require returning to software versions before the first control or second control was executed, and software versions of the plurality of electronic control units other than the some of the electronic control units;
• and
• return the software versions of the some of the electronic control units to the software versions before the updating in response to the consistency being present.

A non-transitory computer readable medium storing an executable program that causes a computer that includes a storage and a processor to execute steps comprising:

• generate a request for downloading update data from a center;
• receive and store the downloaded update data in a storage;
• execute, based on the update data, a control for installing, or installing and activating, updated software on at least one target electronic control unit from among a plurality of electronic control units connected to each other via an in-vehicle network;
• acquire, in response to execution of a first control for installing, or a second control for installing and activating updated software, software versions of the electronic control units;
• confirm that there is consistency in a combination of software versions before the first control or second control is executed in some electronic control units of the plurality of electronic control units that, after the first control or second control was executed, have been determined to require returning to software versions before the first control or second control was executed, and software versions of the plurality of electronic control units other than the some of the electronic control units;
• and
• return the software versions of the some of the electronic control units to the software versions before the updating in response to the consistency being present.