Hello,you can flash your phone with Omnius for free but first identify it and check with Omnius your cid in the phone then download correct files.Make backup of gdfs before flashing and recharge the battery.
You have to register first to be able to use it and there is w995 with cid53 and cid81 version so be shure that you are using correct flashfiles.
You don't need customization file,leave it empty but you must open perform default customization and select the same customization as your region is.