Hi @x_tonino ,
Some things to try and increase the available amount of storage in the phone:
Try inserting a SD card (max 64GB) and move the apps (those that can be moved) from the main storage to the SD card to free up space
Try clearing the app’s cached data to increase storage Go to Apps > Settings > Storage > Cached data > delete
Delete unnecessary download files Go to Apps > My Files > Search for Download > tap on any unwanted file > delete it to the trash can
wipe the cache partition to remove old system updates etc and other cached info that may longer be required
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