There is a problem when trying to log in via OpenSSH 8.8. To solve this, the following options must be added to the script

• PubkeyAcceptedKeyTypes +ssh-rsa
• HostKeyAlgorithms +ssh-rsa

In line 93 the ssh call must be adapted as follows: ssh -o ConnectTimeout=1 -o PasswordAuthentication=no -o PubkeyAcceptedKeyTypes=+ssh-rsa -o HostKeyAlgorithms=+ssh-rsa "root@$remarkable" "$@"