As I had written before, it's all just for security reasons. Unfortunately, AFAIK, there's no way to check whether the seller (l've bought my phone from) has altered the firmware or not. So, I'd like to reflash my device with an official firmware. Blackview bears more considerable reputational risks than an internet store seller (even big one). That's why I trust Blackview more.

As stated many times, firmware files for flashing will come soon. Please be patient!