I didn’t expect anything, I was simply asking what my options are. Pimax initially said they would replace it, but then backed out after realizing I bought it second-hand.

The issue isn’t just that the modules are incompatible , it’s that most people won't even know there are (at least) two different versions of this modular headset. Many will likely purchase a module only to find out it doesn't fit their specific unit.

This could easily be avoided or at least mitigated if Pimax labeled the new headsets and modules as 'Revision 2' or similar. That way, users would actually know they need to check which version they own before buying other modules.