I also have a 2010, would love the .56 firmware. They've sent me firmware privately before, would rather not bother them too much if you've got it to send.If you have a LEX6 VLine2, i can send you the .56 firmware, of you can contact Grom support. They are pretty responsive to troubleshooting. And that may be safer in case we dont have the exact same models.
Thanks!