This is a known issue, RnD is already informed and fix is expected in future firmware updates.
In the meantime, I am sending you a link: https://kaunas.teltonika.lt:444/f/9b37ed998a684e45af3d/
You can download a test firmware with some fixes for wget.
If possible, please flash it without keeping settings as this is a test firmware. While this is a test firmware do not use it massively, first test it on a single device.
Also, please provide feedback regarding this test firmware after your tests.