SPFlashTool ERROR : STATUS_BROM_CMD_STARTCMD_FAIL, device bricked

I was stuck in a boot loop after flashing AOSP ROM. So I decided to power off and use SPFlashTool to flash the stock ROM. But both SP and Tecno flash tools give the following error: > ERROR : STATUS_BROM_CMD_STARTCMD_FAIL (-1073348607) , MSP ERROR CODE : 0x00. The phone doesn't respond to any button presses. However, whenever I connected it to my PC, the charging indicator glows and even Windows can detect it, and the device is listed in ports. Can anyone please help?