I bought the Chinese version with LTE band 4 and it had custom firmware from the seller. When I upgraded to global stable I lost LTE on sim 1. I decided to unlock unofficially while and flashed aosp, LTE worked on sim2 but then I flashed the lastet Eu weekly from here I no longer get LTE even on sim 2. I tried a bunch of different settings and picked manually Bell 4g network, but its still on 3g only. When I put LTE only I get no signal.