Expansion module Avaya IP Office 500 - how to exit firmware upgrade mode?

Question

Avaya

Hello! There is an expansion module for Avaya IPO 500 with 30 analog ports. I foolishly connected with a DTE cable, and wrote "upgrade" in the console. Now the module in the console displays TFTP Poll Sent, and that's it ... no reboot, nothing helps. Tell me how to get it out of the firmware file search mode?