Please include the entire output and console log when trying to boot with the new IOS. If you do commands like "show boot" or "show device" please do not cut the output because ti makes impossible to understand what is going on.
After the image in bootflash starts, it should load the one in disk0: If does don't that, try formatting the bootflash completely, and remove the stamente from config. At this point it should load from disk0:
Before you do that, make sure the image in disk0: is valid and readable.
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...