switch 2960 upgrade failure issue

[ahmedmaged9432]

i have switch 2960-X with version 15.0 have updated to 15.2 but after update to newer version , uplink was down and shows me cisco error msg then i have tried to get back to old version but it keeps reloading to the updated version , after many times to reloaded to bootloader mode  i need to rollback but usb is not working  as below :

switch: dir usbflash1:
ERR: usbd_bulk_transfer fail status 32
ERR: Read ERROR start 0 blks 1
ERR: usbd_bulk_transfer fail status 32
ERR: Read ERROR start 0 blks 1
ERR: usbd_bulk_transfer fail status 32
ERR: Read ERROR start 0 blks 1

what can i do to have the old version and install

[balaji.bandi · Accepted solution]

you must use FAT16 system on a ubs stick maximum of 2 GB capacity,

Switch: flash init  ( try this may not work, but worth issue command

Switch:  boot usbflash0:ciscoimage.bin (change this as per the your image name)  0 or 1 depends USB recognised.

connected the console post complete boot process while doing to understand.

[ahmedmaged9432 · Accepted solution]

i have 4 GB usb stick how to format it by FAT16 

[balaji.bandi · Accepted solution]

you can do as below :

https://www.instructables.com/Format-USB-Flash-Drive-to-FATFAT16-not-FAT32/

[saurabh kubavat]

yes 2960 switch work with less then 2 gb usb and fat 16 format.

*i used 1gb usb with FAT16 format on a usb stick, placed iso in it and it worked with me.

usb is now visible and i can see IOS file now

i have booted with ios and switch is working fine now.

[p oh]

You can boot from a USB size less than 2G with FAT16 format with the IOS but if you don't have one then you can use TFTP:

***boot from compatible USB:**

switch: boot usbflash0:c2960x-universalk9-mz.152-2.E7.bin

**TFTP method**  

I recommend free TFTD64, you can find it here, https://pjo2.github.io/tftpd64/)

switch: mgmt_init

Then assign an IP address to the management interface:

switch: set IP_ADDR 10.0.0.1/255.0.0.0
switch: set DEFAULT_ROUTER 10.0.0.1

##Test connectivty to TFTP
switch: ping 10.0.0.2

Then configure your TFTP server to have an IP on the same subnet and connect it to the MANAGEMENT INTERFACE of the switch (ie 10.0.0.2/24).  MGMT interface should be right next to the console port on the switch.  Connect a LAN cable from your PC to the MGMT port.  Assign IP address 10.0.0.2 255.0.0.0 to your PC.  Assign IP to switch to 10.0.0.1 255.0.0.0 which you already did above)

Now to tell the switch to retrieve the firmware image: (change the filename of the IOS you are using, for example)
switch: copy tftp://10.0.0.2/c2960x-universalk9-mz.152-2.E7.bin flash:c2960x-universalk9-mz.152-2.E7.bin

The switch should then retrieve the image and save it flash.

Once the copy is complete boot from it with: (change the IOS filename that you are using, for example)

switch: boot flash:c2960x-universalk9-mz.152-2.E7.bin