lenovo a628t encryption failed reset
 

So have this set with the above message,client says it did this by itself,tried reading with bypass security but error boot fail still come out,so selected MT6582 yet on google it MT6582M and it worked,but this is message when tying to format userdata

Action : Format UserData.
Selected 0-By CPU:MT6582
Exe version: NCKBox AndroidMTK 2.9.7
Phone must be off with battery inside.
Battery must be charged
Please insert USB cable now...
For some phones need to keep "VOL-" button untill inserting USB cable.
For some phones need to keep "VOL+ and VOL-" button untill inserting USB cable.
For some phones need to keep "VOL+" button untill inserting USB cable.
Detected(44) : MediaTek PreLoader USB VCOM (Android) (COM44)
[44] \\?\usb#vid_0e8d&pid_2000#6&3b3f6816&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Boot mode: Preloader
BBCHIP: 6582 1 ca01
Using Algo 1.
Phone detected...Please wait
Sending DA agent, please wait...
----------------------------------------------------
BaseBand CPU :MT6582
BaseBand CPU Secure Version : FF
BaseBand CPU Bootloader Version : 01
----------------------------------------------------
INT RAM: 128 KB SDRAM
EXT RAM: 512 MB DRAM
----------------------------------------------------
EMMC: (28Gb+4096Mb) HYNIX 0x483447316404
EMMC FW VERSION: 86:00:00:00:00:00:00:00
EMMC CID: 90014A483447316404 : 00000000000000
EMMC UA SIZE: 0xe7000000
BOOT STYLE: EMMC BOOT
FULL LENGTH: 0xe7600000 [3.615 GB]
Status: USB_HIGH_SPEED
Detecting high speed port, wait......
If driver not installed, install high speed port driver.
If not need high speed port, disable it.
After repeat opperation.
Detected(20) : MediaTek DA USB VCOM (Android) (COM20)
[20] \\?\usb#vid_0e8d&pid_2001#6&3b3f6816&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Detecting format adress....wait!
Starting generic userdata format...!
Partition: CACHE begin: 0x30d00000 length: 0x7e00000
Error: S_DA_SDMMC_WRITE_FAILED
Format cache fail.
Partition: USRDATA begin: 0x38b00000 length: 0xad600000
Error: ??
Format userdata fail.
Format adress not detected, aborting!
[0]All done.

Rest to factory defalut worked and so did clean emmc,what could be problem team??:(

This meen in 80% .. 90% of cased bad emmc.
It have read only or bad sectors.
Usually is affected highly used regions, cache or userdata.
Cause can be emmc bad contacts(partially desoldered) or problems with emmc chip.