hi jamarjan, thanks for the dump, I actually managed to get a newer version dumped as well, buying another scale...
I attached them here as well for posterity.
Regarding your problem, I believe you will have to contact a Mettler service center, try a few and see if one offers a reasonable price for the operation, I haven't manage to find copies of the service cassettes, but without those you will not be able to frost initialise the memory and tell the scale what it is but also input all the parameters for linearity and temperature compensation specific to your cell. I think they are written down in the real plate that you can remove to do the corner load adjustment.
I also have pm4600, so maybe I could dump that memory, but my linearity and temperature compensation data will not be correct for your scale.
I think I should dump that for posterity to keep my scale running, but that ic is not on a socket I'm a bit afraid of trying to get it off...