I have a Routerboard RBM33G with a Huawei ME909u-521 LTE card. The LTE interface is working, GPS is not.

There were topics on this forum that people had issues with the GPS of that card and some eventually solved it, but no one said how.

What did you do to make GPS on that card working? Where should I start troubleshooting?

I needed to change a jumper on my Routerboard to route the USB 2.0 signal to the mini-PCIe interface. Without that, my Huawei didn't work at all, as the signal was available on the external USB port and not on the mini-PCIe slot. Now I have done that, the LTE interface is working but GPS is not.

Anyone managed to fix that: what did you do?