I did install my new flat Lens on Eken camera and it works perfect.

You can check sample movie on youtube that compare 2 cameras. Upgrading process is very easy, you need to remove old eye fish lens and then screw a new one.

The is no need to disassembly whole camera because the lens is locked only with a little glue. After mounting the lens, you only need to set the focus well and that's all.