A method and device for downloading a software version and a storage medium, including that: n partitions to be downloaded of a software version to be sent are determined, n≥1 (S101); a mobile terminal is indicated to format a mapping partition corresponding to an mth partition to be downloaded in the n partitions to be downloaded in the mobile terminal, n≥m≥1 (S102); and when it is determined that formatting of the mapping partition corresponding to the mth partition to be downloaded is completed and succeeds, data of the mth partition to be downloaded is packed into an all-0 data packet or a non-0 data packet, and the all-0 data packet or the non-0 data packet is sent (S103).