5.31 Beta ROM

A couple of observations are that to use the ROM, the corresponding !Boot files are required, and once upgraded, there’s no downgrade using the 5.28 ROM (Error parameters not recognised (Error number &1EA). System: Pi3B (PartMan build)

If this is the expected behaviour, it’s all good. :)

Backups are your friend as beta testers ;-)

New Choices features were added to the OS5.29 ROMs that the OS5.28 ROM does not know about and could choke on. Specifically that would be added WimpVisualFlags and the ability to hide !Boot.

Funny, isn’t it. I have seen some merge requests to add some 3.x stuff in order to turn it into a universal boot system and on the other hand someone introduce changes that break it’s usage on even slightly older ROMs.

It’s not the first time WimpVisualFlags caused such an issue. IIRC, under RISC OS Select, some additional flags caused problems due to a too long command line and they had to modify the Choices app to split it on multiple lines.

It would be a good practice to generate extra configuration choices commands in separate command lines prefixed by "X " so that they can fail silently on older ROMs.