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I would try to focus on the root cause rather than trying to apply any work around. The invalid SPIs can happen when the association gets lost, latency an unstable line can cause that to happen. Maybe it's worth raising this with your ISP.
Just a quick thought to share on the shared secret thing. Sometimes you might be using a character that is not supported by one or both devices and there is no specific message to help you with knowing that. Try to use a very simple shared secret and...
My understanding is that once you copy the .bin file to the flash you just need to issue the command "install add file bootflash:< the file name > activate commit and then after the reload the new image should boot up. With regard to removing the old...
I don't think 100Mbps is supported on the 12XT-2X. In fact, it's not listed on the ports specs, however, if you look at some other C1300 models such as 24MGP-4X is listed.
https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-1300-seri...