If you attempt to unpack (the firmware) to a stack with a very high uptime (>2 years) there is a strong chance the "unpacking" process will stop with some funny error message. I have about 183 switch stacks of different sizes Once it boots up, power it down, attach the stacking cables and power the switch up. emergency-install flash:IOS-XE_filename.binĨ. Initiate the Emergency Install so the switch can boot into the correct 16.X.X firmware. The fastest way to copy the firmware file into a switch that is in ROMMON is via a supported USB thumb drive.ħ. So the following steps below will be a continuation. At this stage, the stack is rebooting but the switch with a corrupted flash is dead in the water. IMPORTANT: Check every stack member for the contents of the nf file. Make sure the stack will reboot the new nf file by verifying the boot variable string: show bootĥ. The "on-reboot" option is a bug - It is meant to be "no-reboot" but Cisco left it that way (and I am happy to remind people about it).Ĥ.The last option, "on-reboot", instructs the stack DO NOT REBOOT after the unpacking.Software install file flash:IOS-XE_filename.bin new force verb on-reboot Copy the firmware filename to the 3850 and "unpack": For the remainder of the stack, clean the flash first (important).ģ. Remove the switch with a corrupted flash content from the stack because they will be of no use.Ģ. If I was to recover this stack, this is what I would be doing:ġ. IMPORTANT: Before I start, what 16.X.X firmware are you planning to go? Only after the upgrade is the bug fixed and we can continue to 16.x That version has an issue where the flash on some switches is corrupted so we have to boot from usb in bundle mode first. I ask because we have a fleet of 3850 stacks running 3.3.5SE which is very buggy and Cisco won't allow downloading it anymore.
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