here is a other Way for recovery from newnigma2 Board. tanks gorgone
switch box off
connect lan to network
connect serviceport (miniusb) to pc
windows 10 -> The drivers are installed automatically
check com port in devicemanager com & lpt (example Silicon Labs COM8)
connect power to the box (not switch on)
start putty.exe
point to from SSH to Serial
change Hostname to ur Comport (example com8)
click open
switch box on
press ctrl+c
if u can see CFE> u are ready for starting tftp
start pumpkin.exe allow firewall to connect
back in telnet execute
ifconfig eth0 -auto
u can see ur ip to connect later
boot -tftp -elf XXX.XXX.XXX.X:zImage-rescue-3.14-r0-dm920-20190312.bin (replace XXX.XXX.XXX.X with the ip from the pumpkin pc)
so now u are almost done
open the ip with your browser and u can now flash the latest image
PS: post a full bootlog for more Details ....