After trying to use WP 10, finally we decided again to Windows 8.1. This is done because the Lumia 625H, with 512 RAM force is still not ready to accept an Update to Windows phone 10 from microsoft (last update WP 10 build 10. 0. 10166. 0). This is proved by the findings of bugs which certainly hampers the use of cellphones Lumia. Hope, Update windows phone 10 still continue to be developed so that all mobile phones with RAM 512 Lumia can use the performance of WP 10 Microsoft.