Documentation from manufacturer is available there:
http://professional.rotex-heating.com/manuals/current/rotex-control.html?L=1
Disk copy (dd) is available from there https://mega.nz/#!UBAF0JyR
Decryption key is: !YV_zFloYonvcGYt0V_EaUBIamqQ-6EsLfAkeRVB1xgs