Kinda used to having modern equipment with USB etc, unbricking this was harder than expected and tftpd64 and equivalents weren't proving reliable for me. Hope this helps others.
- Console cable connected from serial/rs232/com port on windows to switch on console port.
- Have a copy of the firmware required from the cisco website
- Have the firmware extracted from tar/zip/whatever, I suggest 7zip.
- Download a copy of Extraputty.
Using extraputty - console in over serial port. Make sure baud is 115200 or this will take hours.
At "switch:" prompt
flash_init
load_helper
copy xmodem: flash:c2960-lanbasek9-mz.122-55.SE12.bin
In extraputty go to "File Transfer" and Xmodem 1k --> Send I initially tried Xmodem instead of Xmodem 1k and there were transmission failures. The 1k sends chunks of 1024 bytes, this seems more reliable in my tests.
Choose: c2960-lanbasek9-mz.122-55.SE12.bin
Wait a while, at 115200, it'll probably take 20 mins-ish
Once successfully transferred:
boot flash:c2960-lanbasek9-mz.122-55.SE12.bin