I try to set a RPI 4 as OTG device mode

• I added dtoverlay=dwc2 to config.txt
• I modified the cmdline.txt so it launches wc2 & g_midi
• I tried ,dr_mode=peripheral too

it works on a pi zero, I see the device under windows 7

on RPI4 I get "Unknown Device" in windows 7 & 10

console=serial0,115200 console=tty1 root=PARTUUID=d9b3f436-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait modules-load=dwc2,g_midi quiet splash plymouth.ignore-serial-consoles

I checked the module is correctly loaded

pi@raspberrypi:~ $ lsmod | grep midi
snd_seq_midi           16384  0
snd_seq_midi_event     16384  1 snd_seq_midi
snd_seq                69632  2 snd_seq_midi_event,snd_seq_midi
usb_f_midi             20480  3
snd_rawmidi            32768  2 snd_seq_midi,usb_f_midi
snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_midi
snd                    73728  17 snd_compress,snd_seq,snd_timer,snd_rawmidi,snd_seq_device,snd_bcm2835,snd_soc_core,usb_f_midi,snd_pcm
g_midi                 16384  0
libcomposite           53248  4 g_mass_storage,g_midi,usb_f_mass_storage,usb_f_midi
udc_core               57344  4 usb_f_mass_storage,dwc2,libcomposite,usb_f_midi
pi@raspberrypi:~ $ aplaymidi -l
 Port    Client name                      Port name
 14:0    Midi Through                     Midi Through Port-0
 16:0    f_midi                           f_midi
pi@raspberrypi:~ $ arecordmidi -l
 Port    Client name                      Port name
 14:0    Midi Through                     Midi Through Port-0
 16:0    f_midi                           f_midi

when I plug the device looking at dmesg -w, I get

[  263.141426] dwc2 fe980000.usb: new device is full-speed
[  263.421383] dwc2 fe980000.usb: new device is full-speed
[  263.601365] dwc2 fe980000.usb: new device is full-speed

something is not quiet right

now I made the Y USB-C cable myself I guess it's working fine since Windows is seeing an usb device

thanks for the time you'll spend on this one