Just did the upgrade from 7.0.3 to 8 on my RPi 2. The upgrade appeared to proceed fine, it rebooted and then froze on the LibreElec boot screen - Libreelec 8.0 official in top left of screen. Tried another twice and also tried beta 3 - same situation. I used the correct update file.
I re-wrote the SD card with 7.0.3 and restored so back to where I was.
Any suggestions - I would like to update to 8.0?