bangle.js 2 firmware install failure

I don't own an Android device. nrf connect for mobile is failing with "Error: 3072 bytes were sent while 0 bytes were reported as received". Also getting a lot of timeouts.

This is a shame because following the failed update, my watch is basically bricked in DFU state.

Secure DFU Service found
Discovering characteristics in DFU Service...
DFU characteristics discovered
MTU set to 131
Enabling notifications for 8EC90001-F315-4F60-9FB8-838830DAEA50...
Notifications enabled for 8EC90001-F315-4F60-9FB8-838830DAEA50
Secure DFU Control Point notifications enabled
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 6006010001000092000000686acd68
Command object selected (Max size = 256, Offset = 146, CRC = 68CD6A68) received
Received CRC match Init packet
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600401
Command object executed
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600201
Packet Receipt Notif enabled (Value = 12)
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600601001000000000000000000000
Data object selected (Max size = 4096, Offset = 0, CRC = 00000000) received
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600101
Data object 1/108 created
Uploading firmware...
Sending firmware to DFU Packet characteristic...
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600301000f000033224a34
Checksum (Offset = 3840, CRC = 344A2233) received
CRC does not match! Retrying...
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Data written to 8EC90001-F315-4F60-9FB8-838830DAEA50
Notification received from 8EC90001-F315-4F60-9FB8-838830DAEA50, value (0x): 600101
Data object 1/108 created
Uploading firmware...
Sending firmware to DFU Packet characteristic...
Writing to characteristic 8EC90001-F315-4F60-9FB8-838830DAEA50...
Disconnected.
Disconnected by the remote device
DFU Failed with Error: 3072 bytes were sent while 0 bytes were reported as received