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RTOS/CC1312R: Update rfWsnConcentratorOadServer from external flash

Part Number: CC1312R
Other Parts Discussed in Thread: UNIFLASH

Tool/software: TI-RTOS

Hello,
I use CC1312 and I started with rfWsnConcentratorOadServer_CC1312R1_LAUNCHXL_tirtos_ccs and rfWsnNodeExtFlashOadClient_CC1312R1_LAUNCHXL_tirtos_ccs examples. They work fine.
Now I need to update rfWsnConcentratorOadServer from external flash (saving a new firmware to ext. flash is not the subject of this question).
I used BIM (Boot Image Manager) from rfWsnNodeExtFlashOadClient example and I modified rfWsnConcentratorOadServer project according to rfWsnNodeExtFlashOadClient - .cmd file and .cfg file (placing code in internal flash, relocate reset vector to address 0xA8). Now when i program BIM.hex and rfWsnConcentratorOadServer.hex together by UniFlash it work only under certain conditions (after many experiments):
1) when I do the following sequence of steps then rfWsnConcentratorOadServer NOT start:
- CC1312 mass erase
- program BIM.hex and rfWsnConcentratorOadServer.hex together by UniFlash
after reset BIM start once (as expected) but rfWsnConcentratorOadServer NOT start

2) when I do the following sequence of steps then rfWsnConcentratorOadServer start OK:
- CC1312 mass erase
- program BIM.hex and rfWsnConcentratorOadClient.hex example together by UniFlash
- program BIM.hex and rfWsnConcentratorOadServer.hex together by UniFlash
after reset BIM start once (as expected) and rfWsnConcentratorOadServer start OK as well -> This is required state.
It looks like my rfWsnConcentratorOadServer project modification is wrong or so. Please can you help me with project setting to generate HEXfile to work with BIM. I made the settings according to rfWsnConcentratorOadClient example project, but I seem to have overlooked something and now I can not find it.
Thank you, BR
Frantisek Lysy