Ionic 5 and android 5,6,7

Hi, i just want to ask, whats the situation with runinng ionic apps on android 5,6 and 7 devices. Iam trying to run my app on android 6 and even on android 7 emulator, but it freezes at loading screen,
In console i get errors like this :

Uncaught SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
Uncaught SyntaxError: Unexpected token =>

Are there any news on this topic? Is there some workoaround to support older android api? My ionic info looks like this:

Ionic:

   Ionic CLI                     : 6.9.0 (C:\Users\xxxx\AppData\Roaming\npm\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 5.0.4
   @angular-devkit/build-angular : 0.803.25
   @angular-devkit/schematics    : 8.3.25
   @angular/cli                  : 8.3.25
   @ionic/angular-toolkit        : 2.2.0

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.1.3, (and 7 other plugins)

Utility:

   cordova-res : not installed
   native-run  : 0.2.8

System:

   NodeJS : v12.16.3 (C:\Program Files\nodejs\node.exe)
   npm    : 6.14.4
   OS     : Windows 10