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Hello RiBe_4725556 ,
CYW20706 ROM contains the BT stack and device boot code. ROM code cannot be modified by customers.
If you are asking to download an custom application, then there is two ways :
- flash download
- RAM download
If you don't have an external flash, then only way is to download to RAM. However it is volatile. So you have to download the application in every power cycle / reset.
I would suggest you to go through WICED-HCI-Control-Protocol.pdf available in WICED Studio SDK to understand the steps to download the application to RAM & flash.