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This is very easy to do for normal user just follow these steps:
menu
setup
blue panel
addons
download gemini server
plugins
Tuxcom
OK
YES
OK
EXIT ALL
menu
setup
blue panel
Plugins
TuxBox Commander
scroll down to var
OK
scroll down to etc
OK
down to passwd and press 4 (edit)
OK on first line
RED to clear line
enter root::0:0:root:/root:/bin/sh with remote buttons like an writing an SMS
OK
EXIT
save YES
EXIT
save YES
EXIT
EXIT
EXIT
then login with telnet
login root
no pass !
type passwd
enter new password
confirm new password
now you can login with your own password