Most devices shipped with Android 6.0 (Marshmallow) , with later updates reaching Android 7.1.2 (Nougat) .
Before flashing any firmware, verify your hardware matches the Ultimate edition: Amlogic S912 Octa-Core ARM Cortex-A53 up to 2GHz. GPU: ARM Mali-T820MP3. Memory: 3GB DDR4 RAM. Storage: 32GB eMMC. Identifying the Correct Firmware (Serial Numbers) beelink gt1 ultimate firmware
Newer versions often patch known system errors and performance stutters. Most devices shipped with Android 6