react native generate signed apk getting older version

1Prerequisite:
2-----------------
3react-native version > 0.57
4
5How to generate one in 3 steps?
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7Step 1: Go to the root of the project in the terminal and run the below command:
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9react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res
10
11Step 2: Go to android directory:
12---------------------------------
13
14  cd android
15
16Step 3: Now in this android folder, run this command
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18  ./gradlew assembleDebug
19  
20There! you'll find the apk file in the following path:
21yourProject/android/app/build/outputs/apk/debug/app-debug.apk
22
23Now you have your .apk file generated, install it on your android phone and enjoy!
24
25Thank you.

1react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/