I've bought a RBM33G and two mini-PCI-e LTE cards: Mikrotik R11e-LTE and Huawei ME909u-521. Neither is working. The ppp interface doesn't show. The cards don't show in system resources.
I tried both slots.
The board also has a WiFi card installed that works, but the LTE cards don't work even if I remove it.
What am I doing wrong? The Huawei's card is listed in the supported hardware, and the second card is by Mikrotik, so it should work, right?
Where to start troubleshooting?