Magnetic Filament Sensor - Firmware Update Error

Shotfire

My sensor is on version 2 and I'm trying to update to version 3
Using latest github download 44a
And, since it successfully erased the chip it won't work at all now
Probably something simple I'm missing but when I try to update the firmware I get this error with or without the ":e" at the end
V1.7 sensor , Adafruit USBtinyISP

***avrdude -p t44 -c usbtiny -U flash:w:FilamentSensor.elf

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e9207
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "FilamentSensor.elf"
avrdude: input file FilamentSensor.elf auto detected as invalid format
avrdude: invalid input file format: -1
avrdude: write to file 'FilamentSensor.elf' failed

avrdude: safemode: Fuses OK

avrdude done. Thank you.***

alankilian

@shotfire It's been a while for me, but doesn't avrdude take HEX files which are produced by objcopy or something like that?

Shotfire

Not sure, I was just following the command line in the WiKi

alankilian

@shotfire Oh I see it's documented HERE.

Well, I'm not sure then.

Here's what I get when I download from Release-44a: Does it match your binary?

kilian@AlanDesktop ~/Downloads
$ file FilamentSensor.elf
FilamentSensor.elf: ELF 32-bit LSB executable, Atmel AVR 8-bit, version 1 (SYSV), statically linked, with debug_info, not stripped

kilian@AlanDesktop ~/Downloads
$ ls -l FilamentSensor.elf
-rwx------+ 1 kilian None 32364 Feb  5 15:19 FilamentSensor.elf

Shotfire

@alankilian I'm on Windows 10 so I'm not sure how to reproduce what your getting from Linux, on Windows it does show it as a 32kb file

alankilian

@shotfire Use the dir command

02/05/2022  03:19 PM            32,364 FilamentSensor.elf

Anyway, it looks like you've got the same file I got, so I'm stumped.

Someone will jump in and help soon I bet.

Shotfire

@alankilian Switched over to a Linux machine running POP_OS and it flashed ok, shows V4 for the version