what have I done? asus-n66u

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kernel-panic69
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PostPosted: Wed Jul 08, 2020 18:08    Post subject: Reply with quote
CFE is the bootloader specific to pretty much all Broadcom SoC hardware. Doesn't matter what firmware is involved. I would have to acquire an RT-N66 and do some reading to offer any specific help.
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graemev
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PostPosted: Thu Jul 09, 2020 14:47    Post subject: Reply with quote
Well to partly answer my own question. The CFE is from broadcom. It's included in their GPL source code, found at:

https://dlcdnets.asus.com/pub/ASUS/wireless/RT-N66U_B1/GPL_RT_N66U_300438251641.zip

There are even a couple of files:

asuswrt/release/src-rt-6.x/cfe/docs/pmon.readme
asuswrt/release/src-rt-6.x/cfe/docs/cfe.pdf

Now the question is "why don't they provide a mechanism to update it?"
kernel-panic69
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PostPosted: Thu Jul 09, 2020 16:41    Post subject: Reply with quote
It should update itself when you upgrade the firmware, I thought.
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Per Yngve Berg
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PostPosted: Thu Jul 09, 2020 16:59    Post subject: Reply with quote
https://www.snbforums.com/threads/cfe-bootloader-update.8259/
https://www.snbforums.com/threads/cfe-bootloader-update.8259/
https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=163479
kernel-panic69
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PostPosted: Thu Jul 09, 2020 17:16    Post subject: Reply with quote
In some cases that may not be so obvious, a bootloader update can be pushed via a firmware upgrade as well...
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graemev
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Joined: 18 Jun 2020
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PostPosted: Thu Jul 09, 2020 17:39    Post subject: Pheww ... that was a Marathon Reply with quote
So I have the Firmware: DD-WRT v3.0-r43516 big (06/25/20
running atop CFE1.0.1.9 ( bl_version=1.0.1.9 )

And .... both 2.4Ghz and 5 Ghz radios are working.
In overview the sequence was:

1: Reflash back to ASUS 3.0.0.4 (actually quite new)
2: Use ASUSWRT to reflash to Merlin (NB both wireless active)
2a: check CFE level, it's still on 1.0.1.2. (so the ASUS flash didn't update it)
3: Upgrade CFE
4: reboot (still Merlin) helpfully Merlin shows the CFE level as part of it's status/version screen (DDWRT does not?)
..confirm now on CFE1.0.1.9 (2014 vintage !)
5: Use upgrade (GUI Button) to DD-WRT v3.0-r43516 big
6: Manual power-cycle + WPS switch to clear RAM

This is by no means a full set of instructions
. Each part has instructions elsewhere, it's just an overview of the maze.
(I need to make updates in a few more places to make this issue clear)
Zyxx
DD-WRT User


Joined: 28 Dec 2018
Posts: 288

PostPosted: Wed Jul 22, 2020 11:37    Post subject: Reply with quote
I bought another N66u (used condition) which was in a really bad state, FW not running, USB defective, dirty as **** Mad

After cleanup and reflash, I wasn't able to login via console, investigated and found CFE 1.0.1.3 to be the culprit.

--> After update of it I was able to login via console.
Also USB does work now Cool

THANK YOU ALL for this thread, it came in quite handy!
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5855
Location: Romerike, Norway

PostPosted: Wed Jul 22, 2020 13:02    Post subject: Re: Pheww ... that was a Marathon Reply with quote
graemev wrote:

4: reboot (still Merlin) helpfully Merlin shows the CFE level as part of it's status/version screen (DDWRT does not?)


You can see it in dd-wrt.

nvram show | grep bl_version
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