plssss help STATUS_BROM_CMD_SEND_DA_FAIL (OxC0060003)

i rooted my phone Lenovo k8 note using magisk and even after flashing stock rom i didn't got the official updates
eventually i then downgraded by mobile phone and flashed nogut i got some updates of nogut i got two updates of nogut then they stopped at dec 2017 update so i thought it could be cause of unlocked bootloader then using fastboot i used following commands

1.fastboot oem lock
2.fastboot reboot

after that my phone didn't rebooted and now there is only black screen with led indicator and i have tried flashing stock rom using sp flash tool moreover i even tried to format the device but i ended getting same error
as follows in sp flash tool
STATUS_BROM_CMD_SEND_DA_FAIL (OxC0060003)
PLS HELP THE DEVICE is not even able to boot into bootloader not even fastboot of anything else pls help

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