Cisco 3650 Switch IOS deleted from FLASH

I’m currently in Cisco 3 class working on switches. I deleted (yes, I know) the IOS out of the FLASH.
Since I deleted the IOS I can only get to the switch: prompt and have so far unsuccessfully been able to upload an IOS to the flash.

I can’t use xmodem as it will take many hours and the teacher wants me to fix it because I broke it (Yes, I know)

I’m trying to load a downloaded copy of the IOS from another switch through tftp
Cisco’s documentation (that I found) only talks about tftp through priveledged exec mode. The teacher says it can be done, but I’m not seeing how.

Can anyone please help?