iPAQ Biometry and encryption [HP iPAQ hx2790 Pocket PC - 126054]

Hi all, I have an iPAQ hx2790 => biometry and encryption. But when I try to configure the encryption (ie. encryption settings AES for Emails, My documents, Tasks, Contacts, etc.), I only have the option for encrypting Emails and My Documents. I want to encrypt my contacts, tasks and calendar, but those options are grayed out, so that I cannot have them encrypted. I contacted HP, HP says I have to upgrade the firmware (which will reset the iPAQ to factory settings). Is there another way ? Did anybody have the same problem and was able to solve it ? Thanks for any help...