Old phones have slower preloader response times (handshake timeout). New tools assume fast USB 3.0/3.1 response. An old version includes longer timeout delays, preventing the dreaded STATUS_TIMEOUT error.
You can find archived versions of SP Flash Tool on reputable forums and specialized blogs. It is highly recommended to use the official 4PDA forum or specialized resources: Download SP Flash Tool v5.15xx - v5.17xx (Stable Options) Download SP Flash Tool v5.1844 / v5.19xx (Legacy v5) download sp flash tool old version