Weights for dedicated inference engine for Qwen3.8-Flash-Next on AMD Strix Halo (gfx1151). One model family, one GPU, every kernel written for this silicon. These weights are in halogen's own.hgn format and will not load in transformers, vLLM, or llama.cpp. They exist to be mounted into the halogen-flash-server container. The checkpoint is TWO files. The sidecar is a patch overlay: a subset of tensors re-quantized more carefully, read in place of the base file's copies. The engine loads.overlay.hgn automatically when it sits beside the checkpoint, you do not configure anything, you just keep both files. Drop it and the model still runs, roughly 5–9% worse on perplexity, saying so in one…