We have found one software suitable in our database for this conversion.
Old .otb bitmap pictures from Nokia devices are still supported in certain graphics editors and converters so saving or exporting them to other format should not be that difficult. If you are looking for a way to export .otb files to .cgm graphics, your best option would most likely be ImageMagick or similar program that seems to be capable of otb to cgm conversion just fine.
Updated: June 15, 2018
OTB
An otb file extension is related to the Nokia OTA bitmap image file format.
CGM
Files with cgm file extension can be typically found as graphics files in Computer Graphics Metafile format. It is used for 2D vector graphics, raster graphics, and text, and is defined by ISO/IEC 8632. All graphical elements can be specified in a textual source file that can be compiled into a binary file or one of two text representations.
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