There are several ways to load an IOS to the switch. The most common issues or failure-to-boot cause is the IOS is corrupt when downloaded from the Cisco website. So, naturally, when you load the IOS from the TFTP to the the switch, the switch will go into ROMmon.
Another thing, you've got to be nuts to load 15.2(2)E. Seriously, this IOS has so many bugs, you need a can of Raid just looking at the switch.
On the ones that cannot boot 15.2(2)E, can you break the boot cycle using the "Mode" button?
If the answer is "yes", then try the following:
1. Copy the IOS BIN file from a working switch to a USB flash drive;
2. In ROMmon, force the switch to boot the IOS from your USB flash drive;
3. If it does not work, try a different IOS, like the EX3 for instance. Try the same process, boot the BIN from your USB flash drive.
4. If it works, try a different IOS, like EX3, for instance. Downgrade the IOS from 15.2(2)E to EX3 and see if the switch can boot normally.
This exercise will determine where the fault is coming from: IOS bug or a hardware batch problem.
To determine if you'e got a hardware batch problem, you may need to look at the serial number of the switches working and not working. From left to right, look at the 4th, 5th, 6th and 7th numerals. This will determine the year and month your appliances were made.
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...