upd.writestr('update.json', json.dumps(update_info, indent=2))

If you have a single critical JAR, pay a developer on Fiverr specializing in "legacy Java ME porting" – expect to pay $50-$150. If you are doing this for fun, download the VRE SDK and accept that 90% of JARs will never run as VXP.

MIDlet-Name: MyApp MIDlet-Version: 1.0 MIDlet-Vendor: Example

echo Conversion complete! pause