it's DS3622xs+ DMS 7.1 was built with RedPill Tinycore loader. I had DS3617xs+ build same way, it worked fine
interesting but /sys/devices/system/cpu/cpu0/cpufreq folder doesn't exist at all
bash-4.4# ls -l /sys/devices/system/cpu/cpu0/
total 0
drwxr-xr-x 7 root root 0 Apr 26 17:51 cache
drwxr-xr-x 6 root root 0 Apr 26 17:51 cpuidle
-r-------- 1 root root 4096 Apr 26 17:51 crash_notes
-r-------- 1 root root 4096 Apr 26 17:51 crash_notes_size
lrwxrwxrwx 1 root root 0 Apr 26 17:51 driver -> ../../../../bus/cpu/drivers/processor
lrwxrwxrwx 1 root root 0 Apr 26 17:51 firmware_node -> ../../../LNXSYSTM:00/LNXCPU:00
drwxr-xr-x 2 root root 0 Apr 26 17:51 power
lrwxrwxrwx 1 root root 0 Apr 26 17:51 subsystem -> ../../../../bus/cpu
drwxr-xr-x 2 root root 0 Apr 26 17:51 thermal_throttle
drwxr-xr-x 2 root root 0 Apr 26 17:51 topology
-rw-r--r-- 1 root root 4096 Apr 26 17:51 uevent
Could someone check DMS 7.1 if /sys/devices/system/cpu/cpu0/cpufreq exists?