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    UC923/UC924(E)/UC926(E) nned need to upgrade the fw920M.rom 

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    UC923 upgrade the fw923.rom, UC924 upgrade the fw924.rom, UC926 upgrade the fw926.rom.

If the DSP parameter of the phone without "D", then 

UC926U/UC926S/UC924U/UC924W/UC923U/UC921U need to upgrade the fw920U.rom 

Image Added

  For the new models

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