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Error during conversion of topo data: “Value for unknown pixels not defined in file”.
For the conversion of topo data in the ASCII grid format please add one line at the end of the header, so that it looks like:
ncols 1000
nrows 1000
xllcorner 290000
yllcorner 90000
cellsize 5
NODATA_value 0.000
Then the conversion of your file is possible.