which softdevice do i need to download when i'm using the newest SDK?

[lilymeow]

Hi, I'm have a question : If i download s120 or s130 softdevice, which SDK version i need to download ? Which version is compatible with my nrf51822xaa ? The reason is when i use some newer SDK , my program can not load into my kit. Thank you !

[endnode]

Hi, you should use some of supported combinations of Soft Device + SDK + chip version (= HW board):

• nRF51 compatibility matrix
• nRF52 compatibility matrix

[lilymeow]

Thanks to your answer, i'd known which version i need to use in my project, the problem solved . Thank you !