Manufacturers regularly update the Android operating system to optimize performance and enhance device capabilities, as well as to introduce new features.
To update the software on Lenovo Phab 2GB tablet, follow these steps:
Step 1: Go to 'Settings'.

Access 'Settings'
Step 2: Select 'About Phone'.

Select 'About Phone'
Step 3: Choose 'System Update'.

Select 'System Update'
Step 4: Choose 'Download' if an update is available.

Choose 'Download' if an update is available
Wishing you success.
