Well it seems I did something stupid and now are unable to recover from it.
I am working as a Network Escalation Engineer in a large Software company.
So I dare to say that I have some clues about networks and software but the current behavior of my SXT G-5HnD is just inexplicably to me.
I beg your help in getting one of my trusted SXT G-5HnD back to work.
Here is what happend.
I succesfully patched the SXT G-5HnD to Version 6.5 this morning.
Everything was working nicely afterwards.
Then I copied the optional “The Dude” RouterOS Package on the Antenna and initiated a reboot.
Yes I took the mipsbe Package 
However I was under the assumption, that the Dude Package uses its own versionning and as its the latest version works with RouterOS 6.5
It seems my Antenna proofed me wrong.
After the Reboot the Antenna dialed in to the WLAN Network successfully, routed traffic as it should and was pingable.
However the Pings timed out for some time every 5 to 15 minutes and no traffic was routed anymore for a minute or two.
I also did got some PIM Warnings via Email that I use to get when the Antenna is booting.
I assume the Antenna was rebooting every 5 to 15 minutes for reasons unknown to me.
I was unable to connect to the Antenna either via HTTP nor Winbox.
So I guess I killed the RouterOS installation.
Well Netinstall then…
After failing continously to revive my Antenna with Netinstall I took a Network trace.
I tried to reinstall 6.5 and as well 5.24. I tried to reset the Config (with Netinstall as well with Reset Button).
And this is where it gets really strange for me.
The Antenna comes up, sends DHCP Broadcasts gets an IP Assigned by the System Netinstall is running on.
So far so good.
Then there is an UDP Stream send to the Antenna (that is before I even click anything in Netinstall).
Right after that Stream the Host Netinstall is running on sends 3 Arp Requests for the IP the Antenna got assigned.
However those ARP Requests go unanswered.
Right after that the Antenna again DHCP Broadcasts for an IP Address but does not get a response from the Netinstall Host.
So far so wiered… seems Antenna lost its IP. I cant tell if it reboots
But here comes the really strange part:
When I then click “Install” in Netinstall it tells me first that it formats and repartitions the Storage on the Antenna and then it states its transfering the System NPK file.
However during all this time there is nothing else to be seen in the Network trace aside of DHCP Broadcasts.
I think I dont need to mention, that the Antenna is afterwards neither pingable nor in any other way responding to traffic.
Netinstall was used from a dual homed Windows 7 with Elevation while one NIC was set to disabled.
I have some questions that I hope help me further in drilling down what my issue ist.
Do I have an issue with Netinstall not behaving correctly?
Did I manage to kill my Hardware with Netinstall? ← however that should work
What other options do I have to gain access to the Antenna again keeping in mind, that a SXT G-5HnD (at least to my knowledge) does not have a serial port.
Any hint/help is higly appreciated!
Yours sincerly
Zarox
