Default [Q] My AU KIDDI OPTIMUS G LGL21 no IMEI and signal

I flashed my LGL21 to be E975W KDZ Few days ago,sucess finally
But after that I cannot dial out and recieve call,even data LTE/WCDMA/GSM are all no signal,no service.
And the IMEI is total lost
then I flash the LGL21 tot to restore the system
But the problem is still exist
What can I do next?
Is it Baseband problem?
Thank You
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