well i got the new sprocket and had a go at getting it on but i cant get the lock ring of the thing.
tried to tap it round with hammer n screwdriver but just chipped some of the plastic of it so stopped.
cant get a grip of it with adjustable pliers either.
so looks like ill have to get a lock ring tool/spanner to remove it without damaging it any more.and get a metal 1 to replace it with.
i also did not need the crank puller as it just came of undoing the Alan key bolt as it don't come out of the crank arm so that was easy to remove and put back on
baeb also said i can get the dongle with the x3 firmware if i wanted it for 75kph tho will have to buy another 1 as mine is the x2 50kph one.