Hello, @PZK
Thanks for your post.
The version you ever used is quite old, for this kind of major version updating, I suggest regenerating the code/configuration, you may firstly select the following combination for reference:
LLCE1.0.10, RTD5.0.0QLP03 and others if needed(HSE FW0.2.64, PFE 1.6.0), because this combination was tested before official release.
Then change the settings referencing your previous work, and generate new code/configurations for the following building and testing.
BR
Chenyin