I met a problem for 3 days with my application ionic 3. In fact, after builder in prod and release mode, it is always the old version that is always taken into account. the chan
remove android platform using
ionic cordova platform rm android remove manually node-modules and package-lock.json (imp*)
ionic cordova platform rm android
node-modules
package-lock.json
Unistall old Application
npm cache clean --force
finally run npm install
run npm install
ionic cordova platform add android
ionic cordova build android