> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/s2gw-installation-manual/s2gw-operation/refresh-of-radio-configuration.md).
# Refresh of radio configuration
The gateway asks B3 for S2 radio configuration sending:
```xml
b8:27:eb:c7:38:d9
9300
Not configured
true
```
The new configuration is also sent from B3 if any changes are made in B3 for a given S2GW. B3 sends an update after receiving any POST from S2GW.
S2GW expects to receive a complete configuration in a single XML.
---
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