r7800 with DomaOS A7Legit V2.3.2.22

[Yammpty]

Hi, how do I put netgear official firmware back on my Knighhawk X4S R7800 that has DumaOS A7 V2.3.2.22 firmware on, it wont tftp back to netgear early versions. Novice needs HELP!

[plemans · Accepted solution]

well you might have a beta unit that is locked because its a beta. Like I said, I've only ever since it on the r7800 on those beta units. 

you might be sol. 

[plemans]

The R7800 never officially supported dumaos. I think it was only on some beta units. 

So you might not find any info on how to clear it. 

reason you don't want dumaOS?

[Yammpty]

Hi its just surfing awa found several people said it was unsafe. Plus I cant seem to get it to take Surfshark VPN on tried with Openvpn set but wont take it. But otherwise I cant fault it  setup was very easy to do seeing as I`m only a novice. Just wish I could get Surfshark on it as I`ve 18month subs left on it. instead of putting it on everything that goes thru internet.

[plemans · Accepted solution]

well you might have a beta unit that is locked because its a beta. Like I said, I've only ever since it on the r7800 on those beta units. 

you might be sol. 

[Netduma-Fraser]

I'm sure you're able to upgrade back to the normal firmware, what does it say when you try to update normally with an R7800 file? TFTP should definitely work - does it upload the file when you TFTP?

[Yammpty]

It looks to be trying but then says timed out, failed. Have tried with several versions of its early firmware.

[plemans]

tftp can be sensitive to timing. You might have to try a few times. 

You can also try nmrpflash. 

https://github.com/jclehner/nmrpflash

[Yammpty]

Hi I tried nmrpflash too that comes back with Block 0#

[Netduma-Fraser]

As above, I think it's more due to the timing, try both of these methods:
https://kb.netgear.com/000059633/How-do-I-upload-firmware-to-my-NETGEAR-router-using-a-TFTP-client-o...
https://kb.netgear.com/000059634/How-do-I-upload-firmware-to-my-NETGEAR-router-using-TFTP-from-the-M...

[Yammpty]

Hi, thanks for the reply a problem I have when I TFTP is when I reboot the router the power light lights up orange but dose NOT BLINK it just changes to white when loaded up and other lights turn white.  So what I have done is entered the PUT command at different times after rebooting ie every 5 seconds after power lights orange : 5 - 10 - 15 - 20 ; 25 seconds & so on. I have put some hours into this still no joy I must be missing something. Fingers are wearing out retyping the command line. I`ve tried both the TFTP as described on last answer several times.

[Yammpty]

I`ve also tried with and without enabled TFTP in Windows Optional Features,
what i`ve noticed in all references to the firmware file as being (.chk) where as
for the R7800 firmware they are all (.img) files that I am trying to TFTP.

BED for me now try again tomorrow, thanks everyone for todays help.

[Netduma-Fraser]

On the Command Prompt guide for example, between steps 7 & 8, hold the reset button down, then do step 8 and when you see 9 happen, let go of the reset and continue the guide and see if that works.

[Yammpty]

just tried that several times no joy, thanks.

[Netduma-Fraser]

The router ID may need to be changed first then, contact NG support and they may be able to do this for you so the upgrade can then complete.

[Yammpty]

I'll try them but i asked them how to get netgear firmware back on from Doma OS and they said they could not help as it had custom firware on, and was out of warranty.

[Netduma-Fraser]

There won't be much you can do then unfortunately

[Yammpty]

Ok thanks for your help, looks like I might have to get my tackle box out and retreive a Hammer.

[plemans]

Still a solid router with dumaOS on it. Probably not worth some hammer-time. 🙂