Meizu m6 frp error

--------- 2019-06-07 12:42:21 ---------
SigmaKey 2.33.00 MTK: Remove FRP (Meizu M6)
Baseband Processor:MT6750, HW Rev. B.00, SW Rev. 0.01
Testing external RAM...DRAM, 2 Gb
Detecting flash...eMMC, Flash size: 14.69 Gb
Reading data...Failed