R&D mode

You can enable the R&D mode by passing the "--enable-rd-mode" to flasher.

When R&D mode is enabled

you can use sudo gainroot to get a root shell on the device

the power button turns the device on instantly (usually you have to keep it pressed for a while)

you can enable some R&D mode flags (flasher --set-rd-flags) for various features:

"no-lifeguard-reset" disables the lifeguard process (lifeguard reboots the device when an important system process crashes)

"serial-console" enables the serial console (the serial port pins are next to the battery) and causes a shorter battery life

"no-omap-wd" ???

"no-retu-wd" ???

"no-usb-timeout" ???