Cannot connect to REPL after firmware upgrade

[PikWay]

Hi,
I was using gPy + pytrack without issues, but decided to upgrade firmare (both - pytack and gpy)
Pytrack went fine:
sudo dfu-util -D pytrack_0.0.8.dfu
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Match vendor ID from file: 04d8
Match product ID from file: f014
Opening DFU capable USB device...
ID 04d8:f014
Run-time device DFU version 0100
Claiming USB DFU Runtime Interface...
Determining device status: state = dfuIDLE, status = 0
dfu-util: WARNING: Runtime device already in DFU state ?!?
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 0100
Device returned transfer size 64
Copying data from PC to DFU device
Download [=========================] 100% 16384 bytes
Download done.
state(2) = dfuIDLE, status(0) = No error condition is present
Done!

Also gpy firmawe upgrade went fine (using firmware upgrade tool v1.16.0).

Unfortunatelly now my VisualStudioCode hangs on
Connecting to /dev/ttyACM0...

[robert-hh]

@PikWay Can you connect with other tools like picocom or screen?

[PikWay]

This post is deleted!

[PikWay]

@robert-hh
Hi Robert,
I've deleted my custom code from the device (using ampy) and I'm now able to connect to it again.
Checking what was causing it to hang.