If the OTA method fails, you must manually "flash" the firmware using specialized software like . Requirements : A Windows PC with Nokia Connectivity Cable Drivers Phoenix Service Software .
For the Nokia Asha 302 (RM-838), the official firmware lifecycle followed this progression: nokia asha 302 software update 15.09 download
Connect the phone in "PC Suite" mode, open Phoenix, select your product type (RM-813), and use the Firmware Update option to "Refurbish" or "SW Reset" the device. Key Highlights of Version 15.09 Fixes & Stability: If the OTA method fails, you must manually
: Reduced crashes and improved overall responsiveness of the 1GHz processor. If the OTA method fails