1. Sign Cydia and download iFile.
2 CLOSE Cydia!
3. Open iFile.
3. Head to the first folder "/".
4. Slide to the top and you will see a search field.
5 Search on "Hierarchy" the application you want to uninstall, so in my case was "MyWi" (without the quotes).
6. deletes all files that contain the phrase you want to delete the application, in my case was "MyWi"
7. Once deleted all files, Closes Open iFile and Cydia.
8. Head to Manage> Packages> "uninstall application" in my case was "MyWi"> Modify> Remove
Now remove it completely!
Finally I solved the problem! Just download and install iFile
1. Open Cydia and download iFile.
2. CLOSE Cydia!
3. Open iFile.
4. Navigate to the top (first) folder.
5 Scroll to the top and you'll see a search field.
6 Search in "Hierarchy" mode for "MyWi".
6. Delete all files container containing the phrase "MyWi"
7. Close iFile and open Cydia.
8. Go to Manage> Packages> MyWi OnDemand> Modify> Remove
Now it will remove it completely!