The story comes from the fact that I bought on msxcartridgeshop.com (yes, I bought) a superb dematerialized game: Shump!
I was able to test version 1 of this game in MSXdev 2013, but the commercial version is much nicer in every way.
But it was impossible to run this version on the SX1 with Sofarun.
Yep, srom doesn't detect correctly the mapper.
Try to run it with SROM SHUMP.ROM /R9
and it'll work just fine 
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