Hi there. Your device reports error 8018830f during the update check. Microsoft explains this is due to limited internal memory on some devices. To resolve, you must flash the original ROM for your Nokia device. Refer to our guide at the following link:
- Restore your Nokia device with Nokia Software Recovery Tool
https://Mytour.vn/8018830f-error-when-updating-to-winphone-phone-81-733n.aspx
Note: During the device boot after flashing or updating, please DO NOT restore the device from your Microsoft account.
