Convert .jar To .vxp

| Issue | Why it happens | Fix | | :--- | :--- | :--- | | | The VXP header is malformed. | Re-pack using MTK Res Maker v5.2. | | White screen then crash | The Java code uses an API (e.g., 3D transforms) not supported by the VXP runtime. | Downgrade the game to MIDP 2.0, CLDC 1.1. | | Keys don't work | VXP remaps keycodes (SEND, END keys are often blocked by the firmware). | Use KeyMapper inside the VXP config tool to map Fire 1 to Select . |

If you don't want to install software, some online tools provide simplified wrapping services. Convert .jar To .vxp

Select VXP as your output conversion option and click "Create". 2. Use Online Conversion Tools | Issue | Why it happens | Fix

There is no "one-click" online converter due to the security signing involved. You must use a desktop tool. The industry standard is combined with VXPTool (or the legacy MediaTek VXP Packer ). | Downgrade the game to MIDP 2

: For developers, the most reliable way is to rewrite or port the code using the MediaTek MRE SDK . This requires setting up an environment with Microsoft Visual Studio 2008 and the MRE plugin to compile source code directly into a Google Groups Implementation & Compatibility Challenges