(2019-03-14)
Problem
3750X with 12.2, I have the 15.2 firmware, how do I upgrade?
Solution
Set up tftp server
Upload new firmware to flash, something like
Do this:
conf t
boot system flash:c3750e-universalk9-mz.152-4.E7.bin
end
Check the value of boot to make sure the new firmware is indicated:
Save
Reload
...wait about 30 minutes, it has a bunch of microcontrollers to flash
When it eventually comes back, check the running version: