It seems Apple rejects universal framework with i386 and x86_64 architecture support. More details can be found in this thread, particularly user big3 (from Apple)’s respond: https://devforums.apple.com/thread/244357?start=25&tstart=0
We can use lipo tool to strip the support for i386 and x86_64 before submit, but note that stripping these 2 architectures will result in failure to compile for Simulator.
Please refer to issue #4 if you have any questions on this
If you wish to strip the framework yourself you can use the following command on OSX
lipo -remove i386 -remove x86_64 WowWeeMiPSDK -output WowWeeMiPSDK