It is never explained why they don't use the Vedran portal between Seefra planets to deliver the relief supplies.
At around 6:40, Harper tells Höhne that to him (Harper), Höhne had been dead for 3 years. While it has been around 3 years in the normal universe, Harper got to Seefra 3 years before Dylan did (S5E3: Phear Phactor Phenom). So, if it was 3 years in the normal universe and 3 years in the Seefra system, Höhne would have been dead to him for 6 years, not 3 as Harper stated.
Becca says the solar flares caused an EMP which shut down the Eureka Maru. The EMP must have been unusually picky because the electric motorized pilot chair still worked, the lights still worked. Random background electrical devices still worked, and her MP3 player still worked.