I just spoke with my boss about the unmarked Mentor device.
We ran a promotion with NewEgg a while back, and a certain number of devices were sent unmarked because they were the first out of the gate. They are definitely the "real-deal" Mentor.
As for the firmware, you should be able to update your firmware to our latest version and have no troubles. Our tech also says the Green Book firmware is fine, and if you aren't having problems with your current firmware, then don't worry about updating.
As always,
support@astak.com is there to help with any firmware issues.