Amazon have approved 1.27 in their store, so Kindle owners should now be able to upgrade.
Before publishing there I fixed a last minute glitch on 1st gen Kindle Fire that caused the sky to go black. This was due to another Android shader bug that I had to workaround.
I am sad to mention that, but the quality of Android software is poor, even with reputable manufacturers like Amazon. They are trying to replicate PC market of the 90s and 00s where all hardware combinations were allowed. The difference is that one could replace a single part in their PCs, or upgrade drivers just for that part. Android does not have that. If you get a device with a single dodgy bit you’re out of luck. You must rely on the OEM to issue an upgrade for the entire firmware, which never happens. They prefer to sell you next year’s model instead. Rant ends.