Upgrade considerations

Regarding which version the phone should be upgraded, you can distinguish it by the follow way.

   Due to the distinction of the hardware platform of the phone, if the DSP parameter of the phone with "M", then 

   UC902/UC903/UC912(G)(E) need to upgrade the fw900M.rom

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

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

    UC902 upgrade the fw902.rom, UC903 upgrade the fw903.rom, UC912(G) upgrade the fw912.rom

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

If the DSP parameter of the phone with "D", then 

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

  For the new models

   UC501 upgrade the fw500M.rom,  UC503(G) upgrade the fw500M.rom,  UC505 upgrade the fw520M.rom,  UC507 upgrade the fw520M.rom.

   UC902S upgrade the fw910M.rom,  UC921(G) upgrade the fw910M.rom

   If you still can't distinguish, you can choose the corresponding file upgrade according to the interface prompt of the phone upgrade.