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If you want, I can convert this into a one-page spec sheet, a developer-facing API reference outline, or a detailed OTA update flow diagram. Which deliverable do you want next?

Based on the features and benefits of the OST-SP1506G RDA5815 V1.0 software, we recommend:

If your receiver is stuck on "Load" or has a display problem, you may need a Dump File (a full backup of the flash memory) to restore it using a serial RS232 programmer tool.

However, you may be able to find it through the following methods: