Unable to upgrade firmware

Hello,

I just bought a Flirc usb receiver and tried to flash it from a virtual machine with Windows. The flirc GUI app restarted and left flirc in a weird state.

I've tried since to upgrade the firmware via the gui on a standalone Windows machine, however it crashes instantly when flirc is connected.

I am unable to go to advanced menu or do any operations with the GUI tool.

I am able to communicate with flirc via my Linux box.  This are the outputs of some of the util commands.

flirc_util device_log
NVMCTRL bad command
Reset Cause:
    SYST:  False
    WDT:   False
    EXT:   False
    BOD33: False
    BOD12: False
    POR:   True

Error starting app
header->boot_flag: FF ?= 0x55
Waiting in bootloader...

flirc_util unit_test
Self test not supported
Flirc Fucked
Flirc Not Okay
Flirc Not Okay

flirc_util settings
3.25.3
Bootloader Version: v3.3.1
[E] lib/libflirc/bootloader/bl_3.3.c fl_sku(115): not a valid image
   Hash:    0x538A716C

Settings:
  sleep detection:  NA
  noise canceler:   NA
  inter-key delay:  NA
  variant:          Flirc
  builtin profiles: NA
  Memory Info:      NA
[E] lib/libflirc/bootloader/bl_3.3.c fl_sku(115): not a valid image
  product sku:      NA
  Records:          NA

What can I do to fix this?
I've read on the forum that maybe flashing firmware to it, might do the trick, but I am unable to find it anywhere.

Thanks