SDK 7.1.0 Compatibility

Question

We have a working application on SDK 6.X.X and I just saw that there is a new update with SDK 7.1.0 
 Few questions: 
 
 In the release notes for SDK 7.0.0 it states that only nrf51422 QFACAB has been tested and other devices should use SDK 6.X.X . Do I understand that correctly ? 
 We use nrf51822 QFAAG0 on our custom board, what SDK version and Softdevice S110 version should we use ? 
 I routinely see updates from Nordic for both the SDK and Softdevice, if we have a working application, are there some reasons we should considering upgrading ? What are the general benefits ? 
 
 Thanks

Øyvind · Accepted Answer

From SDK 7.0.0, the SDK is intended for use with the latest nRF51 Development Kits, which are nRF51422 based. However, the SDK can be used with other kits (which are based on other chip variants) as described e.g here (this is in the 7.0.1 documentation). 
 
 
 To see which chip revisions are compatible with which SoftDevices and SDKs, see ATTN-51 (can be found in the download section of the product pages, e.g. here ). I see that this document lists S110 7.0.0 and SDK 6.1.0 for your chip, but I believe this is wrong. Looking at the release notes for S110, version 7.1.0 should still be compatible with you chip, and from the release notes for the SDK 7.x versions all lists compatibility with S110 7.1.0. I will investigate the ATTN-51 document further, and see if we need to make corrections to it. 
 
 
 As features are added, performance is improved and bugs are discovered and fixed between versions, as a general rule one should use the latest and greatest versions possible. If the project is mature and hard to port to a newer release of the SoftDevice or SDK, at least read the release notes and migration documents thoroughly to see if there are any changes that are relevant to your project, and then make a decision based on that.

SDK 7.1.0 Compatibility

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