Flutter Build Apk Generate Old Version Android App

I am a new flutter programmer and i am trying to build my release app in flutter and when i run flutter run everything work fine in debug and test mode. but when i was trying to build a release app with flutter build apk it create a old first release app of mine . that i created before and i try to reset computer reset android and everything but not work what can i do to reset it and clear the cache? im trying almost delete and reset everything but they dont work. what command that i have to run to fix it and create new version realease apk

Build Apk Generate Old Version
Step 1 
   - We need to run Flutter clean
Step 2
  - Next we need to run flutter run
Step 3
  - Next we need to run flutter build apk
step 4
  - Finally we need to run flutter install