Boot Debian 10 with splash screen

edit file /etc/default/grub

for safety before edit file copy file with new name :
sudo cp grub grub_bakup

commnet line:
#GRUB_CMDLINE_LINUX_DEFAULT="quiet"
add new line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=SVIDEO-1:d"







Save file

run in terminal:
sudo update-grub

Restart System