i need help can not update, any solution

[data] > Device has firmware version 2.1

[data] > Serial number: 0x1F8B6A8D

[info] > Connecting to update server...

[info] > Starting to upload ..

[erro] >> Flash write error -1 has occured ...

[erro] >> Please unplug the device and retry.

[warn] > Waiting for reconnect...

[info] > Erasing the memory ...

[info] > Starting to upload ..

[erro] >> Flash write error -1 has occured ...

[erro] >> Please unplug the device and retry.

[warn] > Waiting for reconnect...

[info] > Erasing the memory ...

[info] > Starting to upload ..

[erro] >> Flash write error -1 has occured ...

[erro] >> Please unplug the device and retry.

[warn] > Waiting for reconnect...

[info] > Erasing the memory ...

[info] > Starting to upload ..

[erro] >> Flash write error -1 has occured ...

[erro] >> Please unplug the device and retry.

[warn] > Waiting for reconnect...

[info] > Erasing the memory ...

[info] > Starting to upload ..

[erro] >> Flash write error -1 has occured ...

[erro] >> Please unplug the device and retry.

[warn] > Waiting for reconnect...



can not update





any solution?



thanks

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