How do you upgrade the system bootstrap on a 2620? I have a router w/ System BootStrap Version 11.3(2)XA4 and another w/ System Bootstrap 12.1(3R)T2.
Where do I find the software at?
I'm not sure it is possible to upgrade the bootstrap by software. But I know it is easier to replace the BootRom with one which has the version 12.1. You can find many such BootRoms on the ebay. The following page is just one of them.