Beyond generic unbranded drives, this controller is documented in products from: (Slim/Mini waterproof series) (Selected 64GB models) (Used in some budget recovery-tool-compatible drives) download link for the Dyna Mass Production tool to fix a broken drive?
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The "AC1" suffix usually indicates a specific firmware mask or revision. The most common variants you will see in software tools are SM3271AD or SM3271AC1 . For all intents and purposes, they function identically. smi sm3271ac1
🔧 A low-cost, single-channel USB 2.0 flash drive controller from Silicon Motion. Found in many cheap/off-brand USB sticks (often 8GB–64GB). For all intents and purposes, they function identically
is frequently used in devices where compact size and high capacity are prioritised, such as: is frequently used in devices where compact size
Search for the specific MPTool version that supports the SM3271AC1 (often versions released after 2017).