How to Update Korean LG Optimus Black KU5900 with Official V20L Firmware
- First up you need to backup all your data which is stored in your phone as in the process of the firmware update there is a possibility that the data in the phone memory may get corrupted. We have mentioned below some of the tips with which you can back up your data.
SMS Messages – Use “SMS Backup & Restore app”,
Contacts Stored in Phone Memory – Sync with the Gmail application,
Call Log - Call Log and Restore
Videos, Images, Videos & Files etc.– Copy to internal / External SD Card,
Internet & MMS Settings – Backup all the settings from “Applications > Settings > Wireless and Network > Mobile Networks > Access Point Names”
- Enable the USB Debugging from the path “Settings > Applications > Development > USB Debugging” as shown in the below image. After this you need to charge your device with at least 60% so as to ensure that the device doesn’t get turned Off in the middle of firmware update. The minimum charge left in your phone should be minimum of 60% so as to just ensure that the phone doesn’t get turned Off in the middle of the firmware update.
So, now let’s proceed to the next page where we will see the procedure to apply the firmware update of V20L in your LG Optimus Black KU5900.