USB not recognized after upgrading to SmartWare 2.4.16

I use to backup data from my USB pendrive until I upgraded to 2.4.16.
Drive has dissapeared from the drop down list of the backup source.
Any hint? Is this related to unsupported Windows XP of this version of WD Samrtware

Hello,

WD Smartware does not support USB flash drives as backup targets or backup source.