This is the boot source of the final Freeme OS v2.39.1 build of the Chinese UHANS S1 Android device.
As per our agreement with my former superior at the European Development Department of UHANS Mobile affiliated with UHANS Mobile Inc, from the 1st August 2019, these stock boot sources, along with a ported TWRP recovery, are released publicly to the open source community licensed under GPL v3.
For further information on the release, reason and licensing, please refer to the UHANS S1 TWRP Recovery repository shared on my profile.