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TPS65982: TPS65982 FW update under win10 or UEFI Shell through EC I2C.

Part Number: TPS65982

Dears,

Now we use TPS65982 develop PC products, and there are some question about PD fw update in windows10 or UEFI shell.
we have read the document of <TPS6598x FW Update From Embedded Controller Over I2C>, and follow the flow chart to programing,
but the result is fail.
The step is:
1, Read Current FW Version. the result is correct. for example, 0xF4.01.37.90.
2, Read BOOT Flags(Reg. 0x2D) and juge the Bootok bit,but this bit always is 0.
So my question is why this bit is 0? and I have read the operational state of the device(Reg 0x03), the result is APP mode,and the type-c port USB/DP/PD function are all ok.