Often (perhaps half the time) when I poweroff my FLX1s then restart it, I get a brief battery icon with a lightning bolt before I get the blue Furi logo. When this happens, the phone then goes to a battery-level display (full screen) before going blank. It never completes the boot. Interestingly, if I then hold the power button down for several seconds, this triggers a reboot, which usually succeeds.
@garydale this is not boot failure but rather charger mode. if device is plugged in and it boots, it assumes it should boot to charger more (similar to android charger mode)
what you want to do is to unplug the device and boot it, then plug it back in