Are you updated with latest OTA update for T8 V3s device ? As the boot time can be different on both device as different model can have different startup set for them however you should consider to check navigation after boot up on both device if any issues with T8 V3s device. Yes the drop down option is not available with Android 5.1 devices as it was with Android 4.4 or earlier however we will always notify you with latest discoveries for device with OTA updater updates. Please check this HDD setup guide .