Open Live-USB its system (or any other), and do the following:
1) Open the Terminal enter the following command:
(nautilus, nemo, thunar)
sudo nautilus
2) In press " + Other Places " window that opens
3) In the right pane, select your Endless OS
4) Mount your OS (click the mouse on it)
5) Open the catalog /etc
6) Find and edit the files: shadow , shadow-
7) !!!! The files shadow , shadow- , must have the same value !!!!
ENCODE PASSWORD FOR REPLACEMENT: (copy-paste)
$6$4AwgBwtY$M0z2Ip5GRfkPNNGEDJVqRPQp/jWUUUihnM68evQsF1kYGp7/q47g3c.NGeUQhCr4AjRHg2oqt6I60sBWf5CiY1
$6$Dvh2y8.JEWGU7/I4$mv0O65igo/.9RaitPIYnmo83ot6fhn9iaf0yqgKnkUjQJaRKFQvMPmL9J234vdqtYp7uIJePKzk2rFj.O.NrK1
$6$TubvQD9J$yPDkkUxh.a6UbvXbMbb1pPpITNE9DWp9S6jmMHQOHxizwVk/f9rGWt9SxbBrUwqAPoUuUaN5187x/lsyZu4Tv.
Reboots, enter an access password
"0000"
(Four zeros)