Viltrox also issued a warning not to update your Nikon cameras’ firmware with third-party lenses attached:
For Nikon Camera Users Updating Firmware
We’ve recently become aware of a new notice issued by Nikon, advising users not to update their Nikon camera firmware while a third-party lens is attached, as this may cause potential issues or malfunctions. As a third-party lens manufacturer dedicated to delivering reliable, high-performance autofocus lenses to creators around the world, we would like to provide the following kind reminders to our valued Viltrox users using Nikon Z-mount cameras:
Firmware Update Reminder
If you are planning to update your Nikon camera firmware, we strongly recommend that you detach any third-party lens, including Viltrox lenses, before proceeding with the update. This is a precautionary measure to avoid any unexpected behavior during the firmware installation process. (source)
Some Tamron lenses may not be fully compatible with the latest Nikon Z8 firmware update 3.0
In the US, Viltrox lenses are sold at B&H Photo. International shipping is available from Pergear and the official Viltrox website. You can get 8% off at the Viltrox online store with the coupon code NIKONRUMORS: