Firmware Picostation M2 //free\\ Guide

Using binwalk (your best friend here), we can see the skeleton:

# Make a persistent directory mkdir -p /etc/persistent/custom cat > /etc/persistent/custom/startup.sh << EOF #!/bin/sh # Your backdoor or automation here nc -l -p 4444 -e /bin/sh & EOF chmod +x /etc/persistent/custom/startup.sh echo "/etc/persistent/custom/startup.sh" >> /etc/persistent/rc.poststart firmware picostation m2

The solution?

For the wireless enthusiast, it’s a perfect learning tool. Flash it back to stock AirOS to understand Ubiquiti’s proprietary mesh protocols. Flash it to OpenWrt for a modern penetration testing Swiss Army knife. Or just keep it as a reminder that good hardware doesn’t need a cloud subscription. Using binwalk (your best friend here), we can

This means you can aggressively modify one partition and still have a recovery path. But it also means you only have ~4 MB for your custom rootfs on each side. Hacking the Firmware (Without Bricking) Let’s say you want to add a custom Python script or a persistent netcat listener. You can't just modify the SquashFS directly (it's read-only and checksummed). Instead, you use the overlay. Flash it to OpenWrt for a modern penetration