Flash meizu m6s (auth) failed...

I try 3 or 4 times, on 2 diferent computers, with 2 firmware from support, allways same:

Firmware package: 20180313145953_intl_prd_fvcs_stable_6.3.1.0G
Processing fastboot flashing on Android ADB Interface[06b4f62b6764]
Flashing in progress. Do not turn off the device !!!
Bootloader is locked and secure boot enabled.
Performing authentication...
[SERVER] MEIZU_FL [M1712,712HFDSG226Q6000] cost: 0, retry: 3, your balance: 5
Backup important partitions...
Dump private partition... Done
Dump...

Flash meizu m6s (auth) failed...

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