Lenovo K10a40 DA error
 

Lenovo K10a40

Card found : S/N : xxxxxxxxxx , v0134
Chinese Miracle II [MTK module] v 1.58

Operation : Check / Read Info [ v1.58 ]

1. Power Off Phone , Remove battery , Insert back
2. Insert USB cable. In some cases require hold BootKey

Wait for phone...
Phone found! [ 7 ]
Sync...
Inital Boot Ok!
BB_CPU_PID : 6737
BB_CPU_NME : [MediaTek] MT6737M|MT6737_S00
BB_CPU_EXT : 0xCB00 , 0x8A00 , 0x0000
Processing BROM stage
Settings for BROM configured!
SecCfgVal : 0x01000000
BromVer : 0x00FF
BLVersion : 0x0001
PreLoader : Active [ Boot with PL ]
BootLdrSS : SIGNED with SPRELOADER
Processing DA stage
DA Select done, will use MTK_AllInOne_DA_v5.1624.16.07
Sending and initialize DA ...

[DA_ERROR] : SECURITYBOOT_BOOT_NOT_ACCEPTED
Boot Error!

Operation Failed
Elapsed: 00:00:15
Reconnect Power/Cable!

Try plug it to USB while keeping both volume keys pressed. Worked for me.

Find my post in Lenovo section, about K10A40 FRP,
download flasher from posted link, use appropriate DA_Agent,
replace in CM2MTK folder (search the infinity section for how-to),
after that phone will boot and you can do desired operations
(sim-unlock, FRP remove, factory reset, re-partition, etc.).

For flashing this phone you will need factory stock rom,
don't use readed firmware from other same phone.

more info - HERE

b.r.
Alex

thanks its working :):)