recover the firmware you need the firmware image, tftp server and add a static ip to your pc. 192.168.1.10
Also you need to rename the firmware image, but can not remember the name. You will see later if the ap try to download over tftp.
Connect to LAN2 and try to ping -t 192.168.1.1
you can reboot the ap and check if lan answer in the first 5 sec after power up.
If yes try this:
I have RBR750, May i know how to get to flash mode... - NETGEAR Communities
Hi, this didn't work. also tried nmrpflash, does not work either. Now serial access is my hope to find out what the problem is.. can you tell me how to use the pins for GND / TXD /RXD?
connecting serial is them with screen and 115200?
Thx in advance!!!!
From left to right it will be:
GND, RX, TX, VCC
VCC is not needed, you will power up with the power plug
And yes seriel speed is 115200
and you need to cross the rx and tx cable, so tx from usb pc adapter needs to be connected to rx on the router
Yep, serial is as @PhoenixG36 describes - I'll try and add a photo into the wiki entry if I can get access sorted.
When you tried TFTP recovery did you get as far as getting the device to download the TFTP image? I'm not sure if it would boot from the stock f/w once restored without being able to change the bootcmd.
I've also had a SXS unit die on me in the last couple of weeks - it appears to boot but I can't access it and I get no output on the serial.
Hi, I got the TFTP recovery now done. But as you mentioned boot from stock does not proceed. after the reboot it starts again with fw_recovery waiting for a put.. Can you give me the right bootcmd to boot from the restored image?
Thx in advance!!
Did you create a variable for the original bootcmd? If so, you should be able to update bootcmd to:
run originalboot
Otherwise the stock value is:
mii write 0x0 0x0 0x800; sleep 1; nmrp; bootdni; boot_DNI_secureboot
thx!
got it run in that alternate way:
env print
Then reset to default:
env default -a
after that saveenv and reboot... And it worked 
@gul can you post the wiki link here? I can edit the openwrt wiki, got this last year
@littlebeatle-git is this a command to reset the variables to default in the bootloader mode????
yes. when you interrupt the autoboot and then type help you will be shown the possible uboot commands. one of that is env. with that found that
https://docs.u-boot.org/en/latest/usage/cmd/env.html
after the command the fw_printenv was reseted like it was with the stock firmware.
There are barebones Dataentry pages for each device, but no device details page yet:
https://openwrt.org/toh/hwdata/netgear/netgear_orbi_pro_sxr80 and
https://openwrt.org/toh/hwdata/netgear/netgear_orbi_pro_sxs80
https://openwrt.org/supported_devices/adding_to_toh - could a new device detail page cover both variants?
Hello all,
I'm writing as to try tog get some help, as I may have somehow bricked the my SXR80 device.
I've installed it using the provided instructions (At least I think so), but I endend up on a state where I could ssh to openwrt, but there was no Luci available, only basic services like network, dhcp and friends.
On an attempt to fix it, I've used sysupgrade with the openwrt-qualcommax-ipq807x-netgear_sxr80-squashfs-factory.ubi image. Wrong call...
Now, after serveral reboots and attempts to get into failsafe mode, this is the state:
I get about 1-3 consecutive ping replies, then it's a silence for about 1 minute, then all this repeats.
Could you please point me out to some instructions on how to recover it?
Network recovery or serial, I can do any, but of course network would be better.
Thank you for all help you may provide!
I think you have to open the case and reload the inram image via serial and then boot. Search in the posts above.
Hello all,
Did just that:
openwrt-qualcommax-ipq807x-netgear_sxr80-initramfs-uImage.itbnetgear_sxr80-squashfs-sysupgrade.bin over to the APsysupgrade netgear_sxr80-squashfs-sysupgrade.binNow, It's all installed and running properly with all SSID's and VLANs needed.
Thank you for the pointers, much appreciated 