NVIDIA debuts SHIELD Preview Program to grant users early access to upcoming updates
A new SHIELD Preview Program is now available for users who own this type of devices. Those who decide to enroll in the program will receive early access to features and improvements on their SHIELD. Moreover, they will gain access to beta forums where they can provide their feedback.
Either you have a SHIELD tablet or TV, you should start seeing beta updates being delivered to your device as soon as your beta program account is enabled. A fair warning though, you won't be allowed to post any information about these updates outside the beta forums.
Please also note that SHIELD Preview Program software is NVIDIA proprietary and confidential. Do not copy, reproduce, publish, blog, disclose, transmit, or otherwise disseminate any information regarding SHIELD Preview Program software, except within the SHIELD Preview Program private forum.
There doesn't seem to be a time limit to sign up to the SHIELD Preview Program, but there may be a limited number of slots available for beta testers.
source: NVIDIA
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Things that are NOT allowed: