The 1202880L1 (2nd Gen) is capable of running current release firmware. In cases where you lack sufficient flash storage capacity for two firmware image files, it's acceptable to delete the currently running firmware from flash. Just don't reboot until you have also uploaded the new version and set it as the primary boot image.
Note: If you require VPN or VQM, then the Enhanced Feature Pack (EFP) version should be used (version ends in ".E" such as R10.9.2.E).
Note 2: Unless you need to make use of a specific feature provided in R10.11.0, it is generally recommended to install the most recent Extended Maintenance Release, R10.9.2 as of this writing.
I appreciate the quick response!
I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post and unmark it and select another in its place with the applicable buttons. If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.
Thanks, I appreciate it and thought I'd marked it as the answer. I successfully upgraded the 3305 and it's working great so thank you for all the help on this.