Migration steps from 3.2.0 to 4.2.0

Hello,

I have a ZenPack which works just fine until 3.2.0.

The ZenPack extends the Device class and changes the Device's factory_type_information.

It works fine on 3.2.0 e.g. the custom options are shown on the left toolbar just fine.

However the same stuff doesn't work on 4.2.0, e.g. only the standard Device options are

shown at the left.

What am I missing? What needs to be done when migrating from 3.2.x to 4.2.x?

Please help,

Thanks!

[attached good.png and bad.png for examples]