For reference, I did this by
- backing up (ensure your backups actually populated the file, I had TWO instances where they BF backup generated an empty file!)
- Screenshotting every tab
- Normal flash upgrade straight to BF v4.5
- Going through and reapplying every setting I could that matched screenshots taken in (2).
- Googled every setting that no longer applied to find guidance on how it should be set (this took me a while)
- Re-backed up after applying screenshot based settings
- Used a diff tool (Beyond Compare) to compare backups from steps (1) and (6).
- Looked up each difference to determine whether intended or not - for unintended changes or those I didn’t understand, I copied the old setting into CLI and saved to new settings
- Setup OSD with HD as originally intended.
Despite my attempts to be methodical/thorough, the drone is not flying as well as it used to, but only marginally worse, still absolutely flyable.
Next steps… Work out/watch a bunch of bids on how to correctly tune the drone.
Thanks for assistance all!