I had an older version of Nethunter on my Nexus 5, maybe 2017. Besside worked fine with internal Wifi. After upgrading to 2020.1, it's no longer working. Source monstart-nh now gives a 'No such file or directory'. I've also tried the 'Wlan1 Monitor Mode' custom command, but gets an error, no such device for wlan1. Have things changed?