I tried to follow yours steps, but I want to save it as BEAM_DIMAP format.
I use L5 LVL 2 products (every band is 1 BEAM_DIMAP).
When i put all the bands in the same BEAM_DIMAP and save it as new product (lets say L5_new_product.BEAM_DIMAP), then I re-open the new product and only the first (main) band has data… the others are black and without data!!
Any ideas?