what is the problem ZTE Z820 MTK
I write full dump and backup files
but when i flash stock firmware at the end the error show
Error: 6128 (S_SECURITY_AC_REGION_NOT_FOUND_IN_SECROIMG)
AUTH info: , version: 0
BROM version[0]: 7.1621.1.0
Loading DA: MTK_AllInOne_DA.bin (4.43 Mi😎
version: 3.3001.00.00, start addr: 0x40000800
Connecting to BootROM...
Power off the phone, disconnect and reconnect the battery(if possible) and connect USB cable...
Scanning BootROM or Preloader port... Done.
Detected MediaTek USB Port (COM40)
Connection status: EHCI:HUB:HUB:USB 1.16 Full-Speed
USB Driver: [MediaTek Inc.] wdm_usb, version: 3.0.1504.0, date: 1-22-2016
Connecting Bootrom... Done.
Sending Download Agent... Done.
Platform: MT6735M_S00, Hw ver: 0xCA00, Sw ver: 0x0000
Secure ver: 0x05, BL ver: 0x00
Secure config: 0x05
SRAM size: 128 KiB
DRAM size: 1 GiB
Storage type: eMMC
Card/BGA: BGA (Discrete embedded)
Manufacturer ID: 0x90 (SK Hynix)
Product name: H8G1e (0x483847316505), rev: 0x07, serial number: 0x0C86AA9D
Manufacturing date: Oct 2015
CID: 90014A48 38473165 05070C86 AA9DA2A1
Capacity: 7.29 GiB(7,830,765,568 bytes)
Boot1: 4096 KiB
Boot2: 4096 KiB
RPMB: 4096 KiB
User area: 7.28 GiB(7,818,182,656 bytes)
USB speed: Full-Speed
Switching to USB High-Speed...
Scanning DA USB High-Speed port... Done.
Detected MediaTek DA USB VCOM (Android) (COM44)
Connection status: EHCI:HUB:HUB:USB 1.16 High-Speed
USB Driver: [MediaTek Inc.] wdm_usb, version: 3.0.1504.0, date: 1-22-2016
Verifying SoC: passed
Verifying CID: passed
Writing preloader, size: 119.71 KiB
Writing lk, size: 336.25 KiB
Writing boot, size: 7.09 MiB
Writing recovery, size: 8.51 MiB
Writing logo, size: 564.25 KiB
Writing secro, size: 132.25 KiB
Writing tee1, size: 415.50 KiB
Writing tee2, size: 415.50 KiB
Writing system, size: 1.88 GiB
Writing cache, size: 8 MiB
Writing userdata, size: 26.52 MiB
Error: 6128 (S_SECURITY_AC_REGION_NOT_FOUND_IN_SECROIMG)
what is the problem