KK3: Amazon Download to PC now AZW3

[Quoth]

The KK3 didn't do KF8 at launch. A later FW upgrade added it.

See
https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW

Previously (ages and ages ago) they only sent KF7 on Download to PC for USB transfer for that model. I just got 4 titles in azw3 (presumably KF8). I suspect Amazon "know" from a Wireless Sync the I've got the last FW, 3.4.3.
One title was a new purchase so I redownloaded some older titles and three where azw3 and one azw.
The 2.5.8 FW is mobi/KF7 only. If you have no Publisher option in Aa then your KK3 has older FW than doesn't do KF8. Download later:

Kindle Keyboard (3rd Generation)

3.4.3
Your serial number starts with B008 download this file.
Your serial number starts with B006 download this file.
Your serial number starts with B00A download this file.

Note: If your device is on a version older than 3.4.2, please visit Previous software versions for Kindle Keyboard (3rd Generation) for instructions.

https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW