ICX7150-C12-Router -- cannot reboot to correct partition due to combo of username and pwd unknown

[Rock1]

Based on other threads wherein switch has been rendered useless after power outage, I'm unable to login to switch because none of the combinations of username and pwd included in other threads work on my device. I found instructions wrt accessing switch via telnet to obtain info and I have screenshots of the information using the commands found in other forum thread. However, I'm stuck without a valid username and pwd. My device does not have a label with the username and pwd and I have tried all other combinations provided in other threads. How can I get my switch to reboot to the correct partition? I have three waps and it's incredibly frustrating that the solution is incredibly convoluted. Please help.