Encryption problem raised with 1.02.21

Hi all. I’ve been using WD HD TV Live for 6 months without any encryption problem in special local (Turkish) characters. Recently device has upgraded it self from 1.01.24 to 1.02.21 and now there is an encryption problem with national characters. Is there a way to “downgrade” the firmware ? I’ve searched but could not find a download link for previous versions of firmware. Any help greatly appreciated !

Thanks in advance.