RT-AC87U Quantenna NVRAM

[Oleksiy Lukyanchykov]

Hi all,

While I was investigating why does 5GHz network not work, I accidentally erased NVRAM (flash_eraseall /dev/mtd1) on Quantenna SoC. After that the router can't find 5Ghz network at all (it says "5 GHz radio is not ready"). I believe that Linux can't boot on Quantenna now. Is there any way to fix that?

 

[binggesoft]

Re-brushfirmwaretry!

 

[Oleksiy Lukyanchykov]

Re-brushfirmwaretry!

Do you know how to update firmware on Quantenna SoC? Updating firmware, resetting configuration and NVRAM of AC87 mainboard didn't help.

 

[dfran1]

Have you tied the recovery mode? If not I would try .

 

[Oleksiy Lukyanchykov]

Have you tied the recovery mode? If not I would try .

Yes, I have been tried and updated firmware via recovery mode. It didn't help.

 

[RMerlin]

mtd1 contains the uboot_env content, which is used for booting the firmware from the Broadcom tftpd server. I doubt this is user-recoverable unfortunately.

One thing that's worth trying is killing the Broadcom-side tftpd, and running it in debug mode. See if you can spot any download attempt from the QTN side of things.

killall tftpd
tftpd -d

 

[Oleksiy Lukyanchykov]

mtd1 contains the uboot_env content, which is used for booting the firmware from the Broadcom tftpd server. I doubt this is user-recoverable unfortunately.

One thing that's worth trying is killing the Broadcom-side tftpd, and running it in debug mode. See if you can spot any download attempt from the QTN side of things.

killall tftpd
tftpd -d

@RMerlin, thank you for idea. Unfortunately I don't see any download attempt. Does Broadcom and Quantenna share same mtd? It seems like mtd5 is filled with zeroes. May be it is erased mtd1 on Quantenna?

 

[RMerlin]

@RMerlin, thank you for idea. Unfortunately I don't see any download attempt. Does Broadcom and Quantenna share same mtd? It seems like mtd5 is filled with zeroes. May be it is erased mtd1 on Quantenna?

No, it's a separate flash chip unfortunately, only accessible from the Quantenna SoC.