I thought you might be interested in looking at arma 2 bad serial number via steam?.
https://forums.bohemia.net/forums/topic/113990-arma-2-bad-serial-number-via-steam/?do=findComment&comment=1894381
× Pasted as rich text. Restore formatting
Only 75 emoji are allowed.
× Your link has been automatically embedded. Display as a link instead
× Your previous content has been restored. Clear editor
× You cannot paste images directly. Upload or insert images from URL.