The Pd1731-a-1.8.7 file is a "Stock ROM" (Read-Only Memory). Unlike custom ROMs developed by third parties, this is the factory-original software provided by the manufacturer.
Launch the appropriate software (e.g., SP Flash Tool). Pd1731-a-1.8.7 Flash File
Restoring a device that is completely unresponsive (Dead Boot) after a failed update or rooting attempt. The Pd1731-a-1
Ensure the device has at least 50% charge to prevent it from shutting down mid-process. Pd1731-a-1.8.7 Flash File
Install the VCOM or MTK USB drivers on your computer so it can communicate with the phone in "Download Mode."