S898t PLus invalid imei /SN

my device was infected by virus
I flash it via SPT with Lenovo_S898T_Plus_4.2.2_(by_xdafirmware.com).zip
after that I did upgrade via wifi
but imei still invalid before flashing imei was good
I tried this tools : https://www.youtube.com/watch?v=3VuXiBBuV5M
nothing happen
could you please tell me how to fix the imei and SN