I am reading some general information about Bluetooth 5.0 improvements here:
It says clearly that Bluetooth 5.0 is not backwards compatible and needs new hardware
If we look at the firmware release notes for Qualcomm ADK 4.0.1 for the CSR8675 bluetooth chip, it says that Bluetooth v4.2 is supported
However, if we look at the firmware release notes for Qualcomm ADK 4.2 (a newer version of their ADK, Audio Development Kit) for the CSR8675 bluetooth chip, it says it supports Bluetooth v5.0
The ADK is just software you install on the computer (IDE, library files, source code) and you can use the same CSR8675 development board and PC-to-board communication modules to download your programs, whether written in ADK 4.0.1 or ADK 4.2
If Bluetooth v5.0 requires new hardware, how is it that the same CSR8675 chip supports both v4.2(ADK 4.0.1) and v5.0(ADK 4.2)? Both ADK 4.0.1 and 4.2 come with their respective firmwares for the CSR8675 chip, and it's the firmware release note documents that state the bluetooth compatibility, but if I understand correctly this firmware is just software and the underlying CSR8675 hardware is still the same
How does the CSR chip do this if Bluetooth v5.0 and v4.2 are hardware incompatible?