[Milhouse]

If I want a very clean instalation of your builds, what official Libreelec version would be best before I update your versions? The new Alpha versions or one of the 8.2.5 version?

The latest LE9 Alpha will be closer to these builds than 8.2.5. If you want to install directly from these builds then

1) Write 8.90.00x to a USB memory stick

Either:

2a) Boot the memory stick into run mode and copy the tar into the Update folder and reboot (again using run mode) so that the USB memory stick is upgraded to my build
or
2b) Copy the KERNEL and SYSTEM files from a Milhouse tar file to the root of the USB memory stick

Then:
3) Boot from the memory stick using the installer mode to install my build to your HDD/SSD

Edit: Forgot this was the RPi thread. Ignore this list as the instructions only apply to a Generic install. For RPi, write the LE9 alpha image to your SD card, boot it in the RPi and then update it with a Milhouse build.