Upgrading with the old image 90314 and a CM3+. Instructions from “full disk reset” works as expected, with some unusually side effects for hardware. Upgrading to latest tarball via serial works as expected. Process took about 2 hours from unscrewing the panel to getting the new Step startup sequencer to play sounds with all screws back in their place. I like the default pattern is a dorian mode this time 
weird stuff
Wifi is not enabled on boot. USB nubbin has blue light illuminated, menu says STATUS: unavailable. Connect and add menus are blank. Hostpot menu does nothing. After two reboots it fixes itself. Between reboots, crone crashed the first time and fixed itself the second.
kernel output
[ 572.462586] dwc_otg_handle_wakeup_detected_intr lxstate = 2
[ 573.012105] usb 1-1.1: new high-speed USB device number 6 using dwc_otg
[ 573.143619] usb 1-1.1: New USB device found, idVendor=0bda, idProduct=8176
[ 573.143627] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 573.143632] usb 1-1.1: Product: 802.11n WLAN Adapter
[ 573.143636] usb 1-1.1: Manufacturer: Realtek
[ 573.143640] usb 1-1.1: SerialNumber: 00e04c000001
[ 573.291399] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Opening the system->wifi menu adds the following two lines
[ 580.044122] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 580.181854] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready