There are a couple of threads in the Developer Zone which mention backwards compatibility issues for nRF51822 BLE with DFU. Some of these are focussed around MCP (Master Control Panel), and suggest using nRF Toolbox (our preference, anyway), and another seems on-point, but never is finally resolved: devzone.nordicsemi.com/.../
We have inventory of devices originally programmed in SDK6.1 and we need to DFU them to program the production application (and probably update soft device and DFU, too). We're using SDK 8, now.
What is the recommended procedure to do this? We know that it will involve modifications to the CRC related to 6.1 not having the extended init packet, but it would be helpful to have a clear direction on how to proceed.
