Actually, just received a care refresh unit. New, as in Feb 27 build. No bumps, but the front end has been chamferred, ever so slightly, in the area the bumps appear. Note that it is slightly asymmetric with the bevel line being a couple of mm further aft on the LHS. On close inspection I am not sure if it is a chamfer. It might actually be colour change due to the material there being slightly different. Hard to tell....Since you got yours back with a defective top cover, Im going to guess that more refurbs with top cover (and serial number) replaced will have these defects. Ive got a few in with DJI now, will see if they come back with defects.
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