IOS:c3560-ipbase-mz.122-25.SEB4.bin is a SMI software. To upgrade it to EMI you have to purchase an EMI licence CD-3560=. First you have to upgrade it to EMI using that part number and then upload the MEI image.
c3560-ipservicesk9-mz.122-25.SEB4.bin is the EMI image that you will download and upgrade on the switch using the normal TFTP mehtod.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...