I've been searching the board to no prevail. i opened Monkey (latest version) and it says nothing about the device firmware 2.6? the License manager however, says:
"This version of Line 6 License Manager adds support for HD Model Packs to POD HD, POD HD500, POD HD Pro, POD HD500X and POD HD Pro X.
In order to authorize HD Model packs, your POD HD must be updated to USB Firmware 1.04 or greater and Flash Memory 2.60 or greater with Line 6 Monkey".
I checked the USB firmware on the device and it it says it's 1.0. I just put in a ticket but am hoping someone else has already resolved this issue. There is no option in Monkey to update the USB firmware. attached is what i see in Monkey