Bitgo Que Es

Hi,
i cant install aps from another source (device ID apk), it says that i should go into developers mode, but i cant. Try to enable dev mode in seeting->FydeOSsettings->enable,Developer mode" but after reboot it change nothing. Trying to enable dev mode in crosh but after typing command ,shell" have answer ,ERROR - ERROR: unknown command: shell". Problems with playstore certs starts after upgrading Fyde from 17 to 18. What can i do to enable play store?