Lenovo XT-1902-3 ( K8 -Note) Hard bricked, Need help...

Phone condition frp lock
frp reset done with miracle tool, then "tool dl image failed", so flashed the cache file with this file with sp flash tool

Code:

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fastboot_manning_retail_user_7.1.1_NMB26.54-74_75_release-keys_retail_US_SVC

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Then the phone got stuck in bootloop. So full flashed with out preloader, so the phone got bricked. I tried with the below file with out preloader

Code:

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MANNING OMB 27.43-20

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and now phone is bricked identifying as mtk vcom port and white notification light also working.
not able to go back to android 7 because roll back not allowed.
need help...