Please fix unknown baseband issue

[pradip pramanick 0]

I have a Lenovo a6020a46 phone.

I accidentally erased its baseband with fastboot by giving command

fastboot erase modemst1
fastboot erase modemst1

Now my phone shows baseband: unknown and imei null

I tried a TWRP restore but it did'nt restore base band.

Please help me fix this

[steaven 20 675]

Need to restore The all DATA From EFS part

Please read this topic

I can to send to you the my EFS backup.. But you lost the original IMEI and s/n