Upgrade Android Phone Transfer Data. Some devices may have additional steps. Download and install the carbon desktop application for your windows mac or linux pc.
Youll see a list of the different file categories and the storage options available on your phone. Please follow the prompts to make the program detect your android phones. Tap send data on the old phone tap receive data on the new phone and then tap wireless on both phones.
Of course if you lose data after upgrading the android version without backing up it doesnt matter because there is a free data recovery software that allows you to recover deleted or lost data without backup thats gihosoft free android data recovery.
The first time you launch. Choose proper mode for data recovery. Copy the data from an old android to the computer. It allows easy and fast transfer of data of different types like call logs messages contacts pictures videos audio etc.