USB not recognized in 3850

[Kn1ghtR1d3rOfD00m]

Hi all, 

Im trying to transfer a IOS image to upgrade a 3850 switch, as soon as I put the USB drive to the front of the switch, I go to the CLI and run the command: show usb-devices summary (it is the only command available) and it shows and display the name and even the serial of the USB, 

however, if I want to see the files (IOS image file) inside the USB, with the command show usbflash0:/ it does not show anything, 

I tried to search for answer on the forum but no like this one, and a lot of post states that with the command: dir usbflash0:/ will display but this command is not available, 

is there a command to active a usbflash0:/ slot ?

I even tried formatting the drive to FAT32 and NTFS but still the same results, 

Am I missing something? 

the current switch IOS image is: 

Cisco IOS Software [Denali], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16.3.1, RELEASE SOFTWARE (fc3)

Switch Ports Model              SW Version        SW Image              Mode

------ ----- -----              ----------        ----------            ----

*    1 32    WS-C3850-24S       16.3.1            CAT3K_CAA-UNIVERSALK9 INSTALL

Regards, 

[gthermae]

And for MAC:

diskutil list

diskutil eraseDisk FAT32 EMPTY MBRFormat /dev/diskN

diskutil partitionDisk /dev/diskN MBR FAT32 "Primary" 4000M FAT32 "Second" R

[syed.faridi]

I had the same issue with 4500-X, USB file when connected to the switch would become 0 in size. Reformatting my USB with fat32 worked, solution provided in this forum is correct.

[Ali.Raeesi]

You can easily use USB 2.0 flash and Fat32 format . 

[izvoran]

new version of routers used USB 3.0 today I have installed cisco C1117

[TyIT]

I ran into this same issue before, I tried a different USB and it worked just fine.