Hello; this is my first time here. I have a Lenovo A3500-F with Android 4.4.2 installed with Kernel 3.4.67. I have been trying to update it to the latest software which can run on it, mainly Android 6.0 (Marshmallow), and after checking a lot of tutorials on the web, they all seem to say download an image file or the custom ROM.
Wait for the system to restart and show us the Android desktop, this can take from 5 to 10 minutes approximately. Update using a PC for TV-Box with RKDevTool. Disconnect the Rockchip device from the power and run RKDevtool executing AndroidTool.exe. Change to the Upgrade Firmware section. First, browse and select the firmware with *.img file.
Make sure you phone is at least halfway charged. With Smart Switch you can actually create a backup of your phone, this is recommended as a first action. Click the Backup button at the bottom of
Update Samsung Galaxy Tab 3 10.1 to Android 4.4.2. Download the 4.4.2 firmware package from the Download link provided above. The download file provided is in the form of a Zip package, so extract it to your PC. You should get a file with .tar.md5 format. Don’t extract the Zip file twice, you should use a . tar.md5 file for the guide.