Q1 - We noted this issue and will optimize it in further firmware.
Q2 - Next, I will take more time to gather all related issues from these kind friends, please be patient.
Q3 - At present, BE model is customized for our domestic enterprises, not for overseas individual users. The site of that vendor(sell this version) is not authorized and unofficial.
Q4 - Regarding 8K model, we're testing kinds of modes and can not give you positive confirmation now, so please follow its progress in our website, hope you understand : )