Updated 3 devices from 19.07.3 > 19.07.4 today. All were successful.
- Linksys E3000 (brcm47xx)
- Ubiquiti RouterStation Pro (ath79)
- TP-Link TL-WR902ACv1 (ar71xx) -- sysupgrade image is now fixed (broken on all prior 19.07.x release builds - context here)