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You have ATJ2091 CPU and probably K9
HAG08U1M flash.
Connect it via USB to computer to power it on. If it boots to ADFU mode when it stays at hourglass but becomes U disk when it boots normally, then the flash is dying in the firmware area.
K9HAG08U1M is MLC DDP with only 1,500 program/erase cycles durability. It was not intended for U disk use. Compare with K9LAG08U1M (5,000 program/erase cycles, MLC QDP) and K9WAG08U1M (100,000 program/erase cycles, SLC DDP).