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PORTING BLE OAD to TI BLE STACK 1.2.1

Hello All,

I have a project which is base on TI BLE stack v1.2.1 and it's mature to be mass production.

For some reason, main one is convenient to update device firmware code from app. 

I started to study and try do the test on TI BLE stack v1.3.1, after while I could modify many project in V1.3.1 to implement OAD success.

But when I come back to do same process on my project base on v.1.2.1. Compiling it is fine, but the firmware dosen't work.

And i try a new project in v.1.2.1 with smartRF05EB+cc2540EM and do same process to implement OAD, after trying many times, it does not work.

I would like to know if any one ever try to implement OAD on TI BLE V1.2.1 and works well ?