ytagger in BananaHackers Matrix space contributed to this documentation.
This was the first KaiOS device to feature eSIM support and 1GB RAM. Network-locked to Consumer Cellular (US).
With the phone powered off, press and hold Power and Volume down at the same time until the screen lights up.
Use the volume buttons to navigate between options and Power key to select.
Boot into Fastboot mode, then select Recovery mode. Once you land at the "No command" screen, hold the Power key and press the Volume up button, then release.
Use the volume buttons to navigate between options and Power key to select.
Dial *#*#9527#*#* to turn on debugging mode and ADB access. When connected to ADB the phone will show up as unauthorized, but still allow debugging.
To "authorize" the phone, copy the verified ADB fingerprint keys from a debug-enabled device (see https://git.abscue.de/affe_null/weeknd-toolbox).
On KaiOS 3, DevTools socket is re-located at /data/local/firefox-debugger-socket.