Unbrick moto e2 xt1506

Please some one help me out, did somebody know how to unbrick my moto e 2nd g xt1506 phone which is not power on when connect with my laptop mobile get on and show the fastboot mode. I unable to get proper stock rom to unbrick, but i still tried lot of methods using moto toolkit flashing some of stock and custom rom by flasing but unfortunately it shows that remote failure failed to erase partition something like that.

Any help meto getover it and give detailedgide.

Thanking you

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