Keep localstorage moving from internal web browser to pedestrian crossing

I developed a cordova app that has been released in ~ 100 tablets. Now we want to use the power of the crosswalk. Everything works, except that we are losing local update information.

I have tried my best answer on google but cannot find any information on how to transfer information from the internal web browser to the transition web interface.

So the question is this: how can I preserve localstorage when updating for a pedestrian crossing? (Or how do I access the local storage of the previous version?)

version version from Cordova: 3.6.3

On update: Cordova: 5.1.1 Crosswalk: cordova-plugin-crosswalk-webview 1.2.0 ( https://github.com/crosswalk-project/cordova-plugin-crosswalk-webview )

Respectfully,

Jeroen