Maemo Certificate Manager can import EAP-TLS certificate only in PKCS12 format with .pfx extension. It must contains:
* private key
* client certificate
* server certificate
* all CA certificates in signed trust chain

If certificate is in PEM format, first must be splitted into separate parts and then converted to PKCS12.

Use this command for creating PKCS12 file "cert.pfx" without password:
$ openssl pkcs12 -export -nodes -passout pass: -out cert.pfx -inkey private_key.pem -in client_certificate.pem -certfile server_cert_with_all_ca_certs.pem