After writing the card, when you insert the SD card into the machine, it takes a few minutes (at worst overnight and stuck) before it boots into the operating system. The firmware in the disk image I received is already up to date, so you can’t update anything — except maybe from the advanced section. The machine seems to work perfectly with all programs and games, but when you need to shut it down/reset it, it won’t start up again. Or should I wait for a certain amount of time after a successful boot? Psu is 5A.