With Nokia Software Updater for Retail, you can flash your phone ti the latest available one for your product code. Nokia Care Suite, and it's various tools, allows you to flash various available firmware's to a Nokia device. Using both, you remove and update fw in your device. With the original OP using a HTC, I don't think these programs will work. That said, I did have a problem with GDR3, removed by reflashing and updating again using first NCS ti remove, then updated OTA and added Dev Preview back. Been working fine since.