Developer reveals hidden Jinja template bug that breaks fine-tuned Gemma 4 on-device deployment

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A developer fine-tuning Google's Gemma 4 E2B model for an on-device PII redaction app encountered a critical runtime error only after the model had fully loaded on a phone. The failure stemmed from an undocumented incompatibility in the Jinja chat template used by LiteRT-LM, which does not support a 'map.get' method referenced in the model's default template. The bug does not appear during model loading or quantization export, making it especially difficult to catch before a live demo or production deployment. Using QLoRA on Google Colab, the developer trained a lightweight adapter on 3,000 samples and outlined a full fine-tune-to-deploy pipeline including the required template patch step. The post aims to help other developers avoid losing hours to this undocumented compatibility trap when deploying fine-tuned models to mobile devices.

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