Watching the video, it appears that the scope is trying to read the SD card and cannot.
It blinks... then goes solid red and then starts blinking again through a couple of cycles.
Be sure the card is properly locked in place, and perhaps clean contacts as Andrew suggested.
Double that if the card is a microSD in a Micro to MiniSD adapter.
There are several threads here on CN on downloading and building a boot/firmware SD card. Not simple in the world of Win10 and Win11.
Basically you need to be running an old WinXP OS to format the card correctly so perhaps a virtual machine or (as I have) and old laptop left around
for these purposes.
Given the amount of reloads that appear to be needed, I'm wondering if there is a coin cell on a board internally that
that's at the root of a lot of these issues? There's little info out there, unlike the LX200 based systems.
I guess it's time to dust off my LS8 and test it out, but it's not likely to happen soon. Too many other things on my list right now.