Hi @letrongphat   Giving customers the online support help and articles don't mean that we are treating them as not tech savvy. These articles or online help will give customers some idea or some lists of basic troubleshooting that they may have skipped.   Furthermore, we've arranged a call from our Tech team tomorrow between 9AM - 11AM to discuss this further. They'll contact you using the phone numbers that we have on file.   Stay safe. BasilDv ... View more