Patent ID: 8095696

Claim:
A firmware rewriting system comprising: a recording medium wherein real data and an identifier group are recorded so that the real data and the identifier group are read in order of the identifier group and the real data, the identifier group being formed by repeating an identifier a plurality of times, the identifier group indicating that the real data follows the identifier group; and an electronic device including: firmware; a plurality of input terminals, any one of which can be coupled to any one of a plurality of playback apparatus capable of playing the recording medium, the input terminals configured for simultaneously receiving digital signals respectively produced by any one of the playback apparatus; a controller that repeatedly selects the plurality of input terminals one at a time in succession to detect whether the identifier is included in the contents of a received digital signal, and when it detects that the identifier is included in the digital signal being received by the selected input terminal, rewrites the firmware based on the real data included in the digital signal being received by the selected input terminal.