Just trying to update to image 5.3.001 on my VU+ Duo4K and have tried 3 different Kingston USB sticks in both front and rear USB ports.
Box panel shows reading and asks to press the Power button. This is followed by programming and then Flashing Image - and that's where it stays with no progress bar. I've left it each time for around 10 minutes and then switched off the power and removed the USB stick.
Turn the power back on and the box reboots back into former working condition image of 5.2.045 which is fine but it would have been nice to update to the latest image.
I just wanted to raise awareness of this issue with the Duo 4K and will try again on the next image release.