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The Galaxy S8 is the first device from Samsung to run Android 7.0 Nougat out of the box thus providing users with the latest Android experience. 
At its heart, the device includes an octa-core Exynos 8895 chipset that delivers stunning smooth performance and also comes with a liquid cooling feature to enable smooth gameplay. The device can effortlessly handle multiple apps simultaneously as there is massive 4GB of RAM.

Method to recover lost messages on samsung s8 [samsung-android-transfer.com]:
Actually,the software is not rare,and it is Samsung Data Recovery. Samsung Data Recovery is a data recovery assistant,which can recover lost and deleted data including call logs, photos, videos, audios, contacts, WhatsApp messages and so on from almost all Samsung devices and SD cards.Besides,because of its massive function of recovery,making it can also recover data from the Samsung which has system crack or the broken Samsung. 

More info;
Recover Deleted Data Contacts from Samsung Galaxy S8 [samsung-android-transfer.com]