7.01.2 indicates device status as registered and connected, however, there is a route in it's routing table:
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 br-lan
which prevents your traffic to be forwarded to the internet.
To remove it, login to the device via SSH and execute this command:
- ip route del 0.0.0.0/0 via 192.168.1.1 dev br-lan
As for 7.03.3 firmware, the same route seems to exist there as well. Did you update with Keep settings option set to on? Could you reset the device to factory defaults and check if it is still present?
Also, it seems that there is an issue of obtaining correct APN with auto setting. To edit the value manually, please login to router's WebUI, navigate to Network -> Interfaces -> [mob1s1a1]. Edit interface settings, set Auto APN option to off and enter custom value, which is:
See if that helps.