M2_UPS_PMH_Manual_V91

For the installer bundled with THIS manual ZIP:
cd ~/M2_UPS_PMH_Manual_V91/installer
sudo python3 install_M2_UPS_PMH.py

After a successful install requesting reboot:
sudo reboot

Reconnect SSH and run:
cd ~/M2_UPS_PMH_Manual_V91/installer
sudo python3 install_M2_UPS_PMH.py --check

The original README.txt/START_PL.txt describe the standalone installer ZIP,
which is also included here as M2_UPS_PMH_Installer_V02.zip. Choose one route.
Keep stable cable power. Installer V02: 20 simulated tests passed; clean-card
hardware validation pending. No automatic MCU firmware programming.
