try: as root: dpkg-reconfigure asl-dahdi-linux-dkms reboot Should now be fixed. Check DAHDI is running by: lsmod | grep dahdi From: App_rpt-users <app_rpt-users-bounces@lists.allstarlink.org> On Behalf Of Rachel Olivero Sent: Thursday, September 13, 2018 9:06 PM To: app_rpt-users@lists.allstarlink.org Subject: [App_rpt-users] Raspberry Pi Kernel and Firmware Versions? Hi all: Someone, and I won't name names, but let's call her Evil Rachel, was trying to solve a problem with rigctl and foolishly upgraded the kernel, kernel headers, and firmware on the Rpi 3 running her node. I think I fixed dahdi, but now I'm getting an error that chan_simpleusb cannot re-open the dsp device, and /dev/dsp does not exist. I'm hopeful downgrading, or some other solution you lovely folks may provide, will fix things. Or, is my best bet just to reimage the card? Thanks, and 73, Rachel AD9O