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This is a replacement PCB for SA 2.5-inch SATA laptop hard drives, with board number BF41-00306A and version MERCURY REV.07, compatible with HM321HI model. It can fix issues such as non-recognition, no power, and unstable reading caused by a faulty original circuit board. Each board is fully tested to ensure reliability. Note: The original firmware chip needs to be transferred from the old board to the new one for normal use.