I'm trying to install iOS 9.2 beta 4 on my iPad, but I'm getting the The iPad 'Carl's iPad' could not be restored. This device isn't eligible for the requested build error. I followed the Apple support article, but with no results.
Before trying to install iOS 9.2, I registered the device's UDID in Certificates, Identifiers & Profiles, as instructed in Apple's guide. I then launched the most recent version of iTunes (12.3.1.23), clicked option + Restore iPad..., and chose the correct file (iPad3,3_9.2_13C75_Restore.ipsw).
The iPad is the 3rd generation iPad (A1430, Wi-Fi + Cellular).
Does anyone know how to solve this problem?
I had the same issue and found the answer on the Apple dev forum.
The trick is to download and install beta 3 first and then update OTA (within Settings on the device) to beta 4. Beta 3 isn't listed on the Apple site, the URL can easily constructed based on the beta 4 file name. The build number of Beta 3 is 13C71. For example, the link to the iPod touch image is:
adcdownload.apple.com/iOS/iOS_9.2_beta_3/iOS_9.2_beta_3__iPod_touch_5th_generation__13C71.zip