Zeo Sleep Manager - how erase past users' data & update firmware?

I tried this in a a sleep apnea forum, but got no responses, so I’ll try again here:

I bought a used ZEO Sleep Manager.

AFAIK, it uses a learning algorithm that takes into account data from past sleep sessions.

So, how do I delete all the sleep sessions of the prior user? (I found instructions for doing so on the Bedside unit, but not on mobile units.)

Also, how do I update the ZEO firmware to include the latest algorithms?

Because they were no longer on Google Play (ZEO was bought out and and the website was shut down), I downloaded the Zeo App from apkmonk (which I hope is safe), and Companion for Zeo from GitHub. Companion can be told exclude sessions from its export database, but the Zeo unit still includes past users’ data, and presumably still learns from it.

Note that I do not have the “Bedside” unit, nor the ZEO Sleep Manager Pro.

The box was labelled
ZEO Sleep Manager
Mobile Sleep Management System

Companion for Zeo gives the following info
Model ZEO301 (maybe because I downloaded an app for that model from apkmong.com??)
HW Version 2.0.1
Serial # 113344000443xxxx (last 4 digits changed to xxxx)
Bluetooth Name: Zeo
SW Version 0.0.56

BTW, when people use “ZEO Mobile”, does that refer to the “ZEO Sleep Manager” or to the “ZEO Sleep Manager Pro” - or are they interchangeable in terms of firmware and software?