Information Reference

https://www.cisco.com/c/en/us/support/routers/1000-series-integrated-services-routers-isr/series.html

Correct procedure for default factory reset of Cisco C1111-4P ISR
https://community.cisco.com/t5/network-management/correct-procedure-for-default-factory-reset-of-cisco-c1111-4p/td-p/4394163

Unable to log into C1111-8P
https://community.cisco.com/t5/routers-small-business/unable-to-log-into-c1111-8p/td-p/5266556

What is the IAS in IOS filename
https://community.cisco.com/t5/cisco-software-discussions/what-is-the-ias-in-ios-filename/td-p/4106139