I believe *#0011# is specific to certain Samsung phones only, also "MTK" means it's for MediaTek SoC based devices, which Samsung doesn't usually make, and there is no "MTK engineer" mode on Galaxy series phones.
What phone have you got there exactly, make and model?
As for restoring the IMEI, you mean it's blank? That can happen if you root and flash an incorrect firmware for your device. And presumably that's what you've done? A fix for that is to re-flash either the correct manufacturer firmware or custom ROM for your phone.
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