The link is down, anyway you could reupload?
I want to to follow you're guide but I have also have the q18ref model, not the MX2. If I follow the original guide and install version 9.0.0, can I still use your files to update or will I need a fresh install? Also, are there any guides for backing up my firmware incase my device gets bricked.
Updated zip containing LibreELEC-AML 9.2.8.16 and inputstream adaptive addon (for youtube)
https://www.sendspace.com/file/ywr8f3
Summary of what you need to do;
Fresh install version 7.95 with 'toothpick AV port' boot.
reboot
'toothpick AV boot' the U-Boot environment patch, this will NOT show any 'patch done' just go to recovery menu (this is absolutely needed to update to the newest LibreELEC), you will only know if the patch hasn't taken when the latest LibreELEC refuses to boot, just redo the patch if this is the case.
reboot
SSH in to LibreELEC and label the data partition to LIBREELEC_DISK (again must be done for the newest LibreELEC)
copy the latest update .tar file to /storage/.update
reboot
As for the unlikely brick, you can only nearly brick the box by installing a version of a U-Boot binary that isn't compatible (not ARM or wrong ARM build). This can be reversed with an FTDI cable soldered to the jtag pads on the Amlogic board and by factory booting u-boot on an SD to manually patch the NAND with a working U-Boot. But you won't need to do any of this if you stick to the versions posted here.
The other thing that seems like a brick would be if you break the U-Boot environment (which will likely result in recovery menu), but that can easily be reversed by just reinstalling everything the same way as shown here.
Download links only stay up for 30 days, so grab it while you can.