The .upd file (UTF-8, .ini -style or XML) includes:

Not all "dumbphones" support the VXP format. For example, many newer Nokia S30+ models have limited support for third-party VXP files unless they are specifically signed or patched. Success Rates:

Open analyzer.bat (from the UPD tool). Drag your .jar onto it. The script will output:

en_USEN
elEL en_USEN