I bought my BV6000 2 weeks ago and I had the same issue. I tried everything, but its not connected to 4G only 3G (T-Mobile Hungary).
I installed this latest OTA update, and it was still the same after installation, no 4G, only 3G.
I didn't change anything, but a few days later, I woke up in the morning, and look at my phone, and it was connected to 4G.
Since then it is always on 4G, if thats available.
I dont understand what could happen, but I suggest you ask your service provider, some provider limit 4G connection for certain IMEI domains/manufacturers, or simply because of protocol incompatibilities.
I also did this earlier with no results, but worths a try.
CHeers
FredMed wrote:Anyone having problems with the 4G connection like me?