HI all: Because the application code is relatively small, bootloader is used dual_bank_mode, but now the application code becomes large, OTA can not upgrade, I would like to upgrade to dual_bank_mode until sigle_bank_mode by OTA , but I found it is same dual_bank_mode after upgrading(I had try to used softdevice+bootloader but can't update bootloader,only upgrade bootloader also can't), can I how realized it , I use the SDK 8.1
