Booting problem on RAK4631

I reflashed a 4631 with tthe most recent alpha SW and some older versions. I see this on the serial console. Any idea what is going on?

��@INFO  | ??:??:?? 3 

//\ E S H T /\ S T / C

DEBUG | ??:??:?? 3 Filesystem files:
DEBUG | ??:??:?? 3  RAK (108 Bytes)
DEBUG | ??:??:?? 3  MODE (1 Bytes)
DEBUG | ??:??:?? 3  module.proto (119 Bytes)
DEBUG | ??:??:?? 3  channels.proto (143 Bytes)
DEBUG | ??:??:?? 3  db.proto (2393 Bytes)
DEBUG | ??:??:?? 3  config.proto (89 Bytes)
DEBUG | ??:??:?? 3  neighbors.proto (84 Bytes)
DEBUG | ??:??:?? 3  meshtastic.txt (0 Bytes)
DEBUG | ??:??:?? 3 Using analog input 5 for battery level
INFO  | ??:??:?? 3 Scanning for i2c devices...
DEBUG | ??:??:?? 3 Scanning for i2c devices on port 1
INFO  | ??:??:?? 3 No I2C devices found
DEBUG | ??:??:?? 3 acc_info = 0
INFO  | ??:??:?? 3 Meshtastic hwvendor=9, swver=2.3.3.8187fa7
DEBUG | ??:??:?? 3 Reset reason: 0x0
DEBUG | ??:??:?? 3 Setting random seed 3122714132
INFO  | ??:??:?? 3 Initializing NodeDB
INFO  | ??:??:?? 3 Loading /prefs/db.proto
INFO  | ??:??:?? 3 Loaded saved devicestate version 22, with nodecount: 24
INFO  | ??:??:?? 3 Loading /prefs/config.proto
INFO  | ??:??:?? 3 Loaded saved config version 22
INFO  | ??:??:?? 3 Loading /prefs/module.proto
INFO  | ??:??:?? 3 Loaded saved moduleConfig version 22
INFO  | ??:??:?? 3 Loading /prefs/channels.proto
ERROR | ??:??:?? 3 assert failed /home/runner/.platformio/packages/framework-arduinoadafruitnrf52/libraries/Adafruit_LittleFS/src/l
FATAL: read zero bytes from port
term_exitfunc: reset failed for dev UNKNOWN: Input/output error