help me n910h flash error..!!!

hi to all...
i try flash n910h with 5.1.1 or 5.0.1..
show me all time this error....
help me please..

[Firmware update started.]

Checking firmware presence...
Firmware version: N910HXXU1BOE2/N910HUWM1BOF2/N910HXXU1BOG1/N910HXXU1BOE2
Firmware version friendly name: Lollipop(Android 5.0.1)
Starting / resuming firmware download.

Downloading firmware...

Extracting firmware...
Unzipping firmware: N910HXXU1BOE2_N910HUWM1BOF2_N910HXXU1BOG1_HOME.tar .md5.

Processing firmware...

Flashing firmware...
Waiting for download mode.
Connecting.
Reading PIT.
Flashing sboot.bin.
Flash firmware failed.
Finished at local time: [11.07.15 18:11:11]
WorkID: 7736213

bye br

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help me n910h flash error..!!!