PostBest Flashing steps :

Best Flashing steps : (Flash a fastboot stock rom of your region once in a month for a clear bugless start) AOSP - Flash stock miui rom Clear Data , dalvik .... Flash fw Flash rom Format data Reboot to recovery Format data Reboot to system MIUI/HOS - Flash stock miui rom Clear Data , dalvik .... Flash rom Format data Reboot to recovery Format data Reboot to system PORTS : Flash fastboot stock rom of your region.(Very mandatory) Flash stock miui rom Clear Data , dalvik .... Flash fw Flash rom Format data Reboot to recovery Format data Reboot to system All Flashing steps are the same. If you use ports like oos / cos etc ... You must flash the fastboot rom . For miui/aosp you can flash recovery stock rom.