Are you using the same keystore certificate as you used earlier for the same app? If you have used the default certificate to build the app earlier, you would have to go to account settings and convert the legacy certificate into the new certificate schema using the thick arrow and use that certificate.
You have to extract the apk and need to use keytool to reveal the certificate.
If you built using Intel XDK earlier, it uses the default certificate. In the 3088 version, make sure you converted your "legacy certificate".