[Bug] Error 127 when flashing hands .epp file with DFU bootloader

[Franiac]

Describe the Bug

When flashing my Avalanche v4 with Sea Micro (white) controllers and DFU bootloaders, I get an error at the end:

make: *** [platforms/avr/flash.mk:71: dfu-split-left] Error 127

Here's the complete output:

qmk flash -kb avalanche/v4 -km default -bl dfu-split-left
Ψ Compiling keymap with make -r -R -f builddefs/build_keyboard.mk -s dfu-split-left KEYBOARD=avalanche/v4 KEYMAP=default KEYBOARD_FILESAFE=avalanche_v4 TARGET=avalanche_v4_default VERBOSE=false COLOR=true SILENT=false QMK_BIN="qmk"


Generating: .build/obj_avalanche_v4_default/src/default_keyboard.c                                  [OK]
avr-gcc.exe (GCC) 12.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Size before:
   text    data     bss     dec     hex filename
      0   22050       0   22050    5622 avalanche_v4_default.hex

Generating: .build/obj_avalanche_v4_default/src/info_config.h                                       [OK]
Generating: .build/obj_avalanche_v4_default/src/default_keyboard.h                                  [OK]
Copying avalanche_v4_default.hex to qmk_firmware folder                                             [OK]
Checking file size of avalanche_v4_default.hex                                                      [OK]
 * The firmware size is fine - 22050/28672 (76%, 6622 bytes free)
Flashing 'eeprom-lefthand.eep' for EE_HANDS split keyboard support.
Bootloader Version: 0x00 (0)
Checking memory from 0x0 to 0x6FFF...  Not blank at 0x1.
Erasing flash...  Success
Checking memory from 0x0 to 0x6FFF...  Empty.
Checking memory from 0x0 to 0x7F...  Empty.
0%                            100%  Programming 0x80 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
0%                            100%  Reading 0x400 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
Validating...  Success
0x80 bytes written into 0x400 bytes memory (12.50%).
Checking memory from 0x0 to 0x567F...  Empty.
0%                            100%  Programming 0x5680 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
0%                            100%  Reading 0x7000 bytes...
[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
Validating...  Success
0x5680 bytes written into 0x7000 bytes memory (77.23%).
make: *** [platforms/avr/flash.mk:71: dfu-split-left] Error 127

Line 71 of flash.mk is the call for writing the hands .epp to the controller. I did that some time ago with QMK Toolbox, so my firmware does run without any problems anyways, but this error should not happen, i suppose.

Here's the section from flash.mk:

dfu-split-left: $(BUILD_DIR)/$(TARGET).hex cpfirmware check-size
	$(call EXEC_DFU,eeprom-lefthand.eep)

The firmware compiles fine and gets written to the controller and verified successfully, but writing the hands file to the controller fails.

Keyboard Used

avalanche/v4

Link to product page (if applicable)

No response

Operating System

Windows 11

qmk doctor Output

Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.5
Ψ QMK home: C:/Files/Repos/QMKFirmware
Ψ Detected Windows 10 (10.0.22631).
Ψ QMK MSYS version: 1.9.0
Ψ Userspace enabled: False
Ψ Git branch: franiac
⚠ Git has unstashed/uncommitted changes.
⚠ The official repository does not seem to be configured as git remote "upstream".
Ψ All dependencies are installed.
Ψ Found arm-none-eabi-gcc version 12.2.0
Ψ Found avr-gcc version 12.2.0
Ψ Found avrdude version 7.0
Ψ Found dfu-programmer version 1.1.0
Ψ Found dfu-util version 0.11
Ψ Submodules are up to date.
Ψ Submodule status:
Ψ - lib/chibios: 2024-02-17 19:20:06 +0000 --  (be44b3305)
Ψ - lib/chibios-contrib: 2024-04-03 20:39:24 +0800 --  (77cb0a4f)
Ψ - lib/googletest: 2021-06-11 06:37:43 -0700 --  (e2239ee6)
Ψ - lib/lufa: 2022-08-26 12:09:55 +1000 --  (549b97320)
Ψ - lib/vusb: 2022-06-13 09:18:17 +1000 --  (819dbc1)
Ψ - lib/printf: 2022-06-29 23:59:58 +0300 --  (c2e3b4e)
Ψ - lib/pico-sdk: 2023-02-12 20:19:37 +0100 --  (a3398d8)
Ψ - lib/lvgl: 2022-04-11 04:44:53 -0600 --  (e19410f8)
Ψ QMK is ready to go, but minor problems were found

Is AutoHotKey / Karabiner installed

• AutoHotKey (Windows)
• Karabiner (macOS)

Other keyboard-related software installed

QMK Toolbox

Additional Context

No response