The present invention relates to a reprogramming method of an electronic control apparatus.;The reprogramming method of an electronic control apparatus according to the present invention includes determining whether to compress data received by a device requesting reprogramming data, and restoring and merging the compressed data if the data is compressed; And dividing the merged data into data sizes according to an architecture of the electronic controller, and performing reprogramming using the divided data.;ECU, Reprogram
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