[Help!]how to unbrick Infocus M260

Please tell me how to unbrick my Infocus M260 device.I tried to clear userdata and cache using stock recovery and in fastboot mode but it still doesn't work.I tried to download stock rom frow firmwarefile.com and flash using the SUT L3 but it showed error .Error Code : 0xc3b5.I also tried to flash by SUT LR Tool but it showed that the image(stock rom) is corrupted.

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