If you cannot find the specific firmware files inside the MPALL pack, you may need to search specifically for "Silicon Power V3700 firmware dump PS2251" to find the specific .bn file that matches the NAND memory inside your specific batch of drives.
If you cannot find the specific firmware files inside the MPALL pack, you may need to search specifically for "Silicon Power V3700 firmware dump PS2251" to find the specific .bn file that matches the NAND memory inside your specific batch of drives.