specifications at gsmarena from HERE
Firmware
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File Name: S7-721u_V100R001C232B008_General__Android 4.3_05012FAY.zip
Size: 612 MB
Build: V100R001C232B008
Firmware – Download
File Name: S7-721u V100R001C314B002_Client Software_Czech Republic_operatorValue_android 4.3_EMUI 1.6_05012XMA.zip
Size: 627 MB
Build: V100R001C232B008
Firmware – Download
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