Cannot flash/set/change/rewrite IMEI of my MTK6797 phone. Need help.

Hi there!

I have Zopo Speed 8 (ZP955, MTK 6797) phone and I flashed a custom ROM to it.
Then I found out that OTG & NFC are not working with that custom ROM so I flashed the stock ROM to it.

After that I tried to set/change the IMEI of the phone but haven't had any success with it.
I've tried everything, Chamelepheon, IMEI Changer, MTK engineering tool, SN writer, IMEI changing tool. None of them worked.
Chamelepheon is the only app which will reset IMEIs and after that I've succeeded to get random IMEIs to the phone by rebooting it and going to MTK engineering tool. But cannot set/write original IMEIs to the phone.

Any suggestions how to proceed to be able to get original IMEIs to the phone?

Thank you in advance.

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