Hi!

Try some of the following stuff and let me know how it goes and if you need further advice. These are separate ideas, they don't need to be followed in a specific order.

• Try using recovery mode. Press R+L+A+(D-PAD)-UP while booting. Then update.
• Remove the battery while the system is on, make sure there is no SD card inserted.
• Power it up, press and hold the power button until it dies, the SD card can be inserted for this. Also make sure that both Wi-Fi and 3D are off.