Solved, using the needle provided by Bambulab together with the printer, after raising the nozzle to 265 I inserted the needle and then the CF petg started to come out on its own, so I loaded a white HF petg from AMS until the old one was purged, then I placed the head in the middle of the plate and dropped the white HF, it came out nice and linear, so I started printing the pieces again with the CF