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Enables checking and uploading firmware updates for printers operating in LAN-only mode without Bambu Cloud connectivity. Features: - Automatic firmware version checking against Bambu Lab servers - Orange "Update" badge on printer cards when updates available - Firmware update modal with version info and release notes - One-click firmware upload to printer SD card via FTP - Real-time upload progress (actual bytes transferred) - Step-by-step instructions for triggering update from printer - Local firmware caching for faster re-uploads - Supports all Bambu Lab printer models New files: - backend/app/services/firmware_check.py - Version checking service - backend/app/services/firmware_update.py - Upload orchestration - backend/app/api/routes/firmware.py - REST API endpoints Also includes: - FTP upload progress callback support - 10-minute upload timeout protection - Firmware cache directory in .gitignore