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Forum Discussion
Jeffwb2u
May 09, 2026Aspirant
Invalid Firmware error
I have a Netgear RAX43v2 Router currently running Firmware version 1.1.3.18. I have tried several methods to update the router to a new firmware version, but no matter what I try it says that the Firmware is Invalid.
Has anyone else had this issue and been able to successfully resolve it? I have tried loading several version of the firmware 1.1.3.18, 1.1.4.28 and 1.1.6.36. There is no luck updating them either by TFTP, or through the Advanced>Administration>Router Update page.
7 Replies
- CrimpOnGuru - Experienced User
It would be very helpful if you can double check that after downloading version 1.1.6.38, you extracted the firmware image file RAX43v2-V1.1.6.38_2.1.34.chk and this is the file that is what is being used for the manual firmware update.
- Jeffwb2uAspirant
The Advanced upload page will only let you upload a file with the .CHK extension.
What I really wish is that Netgear would post MD5 Hashes of the files so that they could be checked for corruption in transit, (or even corruption in place if Netgear delivery channels are ever hacked). Without a hash of the file, there is no way beyond looking at the byte size to know if the file has been changed in any way.
I also wonder why they used .CHK as the extension as it is a commonly used file extension used with Chkdsk and ScanDisk.
- FURRYe38Guru - Experienced User
Try changing the .chk to .img.
- FURRYe38Guru - Experienced User
And you were sure to unpack the .zip file before attempting to apply it?
What browser were you using? Try MS Edge or FireFox?
May need to contact NG support and ask for help on this...
- Jeffwb2uAspirant
Firefox made no difference. Still says the Firmware file is Incorrect.
- Jeffwb2uAspirant
I tried Edge and Chrome. Haven't tried Firefox. I am up to level 3 support from Netgear at the moment, waiting for level 3 support to call me back on a week day.
- FURRYe38Guru - Experienced User
OK, Ya I think I saw this once before with another poster. NG support will need to help you out on this one.