Why you need to flash file or flash the phone?
Because when we face different issues in phone software like its shows some errors, like unfortunately app stopped etc.
It stuck on logo screen, its definitely software problem and sometimes its restart randomly , these all issues shows us software problem in your phone.
So we need firmware to sort out these types of problems.
First need to flash tool for flashing the phone.
2nd thing is firmware which you install in phone …. So i give you proper firmware of Micromax Dual 5 which work properly in your phone.
Firmware details: Micromax Dual 5_6.0.033.P3.170320.QK1515 : Download