Accidentally installed MT7-TL09 B511 Android Marshmallow on MT7-TL10. Phone is Bricke

I accidentally installed the B511 Marshmallow update which was for MT7-TL09 version of Mate 7 on my MT7-TL10 Gold version. I did not notice the version no. on the file and now my phone is bricked. I have tried everything to revive it. Put different versions of softwares UPDATE.APP in dload folder and tried to force update it but the software failed at 5% and I also tried to fastboot system.img from previous updates but no luck. Now the phone won't go to recovery mode and neither to system update menu. Only bootloader remains and the phone is now stuck on the 1st bootloop. Please can anyone help me revive my phone? :(

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