Reddit wont let me read it because its "unreviewed content"
reply
this process worked on my raspiblitz:
##start
tor --version #verify <0.4.7.7
dpkg --print-architecture #verify arm64
sudo apt install apt-transport-https
lsb_release -c #verify buster
sudo nano /etc/apt/sources.list.d/tor.list
##add repos
deb [signed-by=/usr/share/keyrings/tor-archive-keyring.gpg] https://deb.torproject.org/torproject.org buster main
deb-src [signed-by=/usr/share/keyrings/tor-archive-keyring.gpg] https://deb.torproject.org/torproject.org buster main
##save
sudo wget -qO- https://deb.torproject.org/torproject.org/A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89.asc | sudo gpg --dearmor | sudo tee /usr/share/keyrings/tor-archive-keyring.gpg >/dev/null
sudo apt update
sudo apt install tor deb.torproject.org-keyring
sudo apt dist-upgrade -y
tor --version #verify 0.4.7.7
##end