0x14 RW firmware key version rollback detected error

[DennisLfromGA]

A poster in CBC reported this error on their Lenovo N20 Chromebook (clapper):

HW: Clapper D6A-E5K-B6A-A5N 

recovery_reason: 0x14 RW firmware key version rollback detected

 

They have tried to recover it using the 'Chromebook Recovery Utility' but can't.

It looks like recovery images are available for versions: R61 thru R65

Will any of those versions recover from this error or is it not possible?

Some of the recovery reasons are still a mystery to a lot of us, we're not sure which ones are recoverable and which ones are not.

Thanx in advance for any advice,

~Dennis

[Camdyn Saludo]

Looks like there's a bug on it. It's fairly old, though. 

https://bugs.chromium.org/p/chromium/issues/detail?id=394098

Status is: WontFix

So I'm guessing it can't be fixed...?

-Camdyn-

[Mike Frysinger]

that bug isn't really relevant.  it's about a test lab setup.

that error happens when a firmware version was installed with key versions older than whatever the device saw most recently.  so if the user installed some unofficial/incompatible firmware into the device that rolled the keys forward, and then tried to install older versions again, you'd prob hit that screen.  if i'm reading the fwver=0x000a0002 correctly, something updated the key version to 10 which we haven't done on clapper (it's sitting at version 5 currently).

if i had to guess, they somehow booted a glimmer image (which uses the same root key, but has firmware version set to 10) on that clapper device which got it into this bad state.  if that is the case, then i don't think any recovery image will help.  you'd have to remove the write protect, manually reset the key versions, and then re-enable the write protect.

-mike

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[DennisLfromGA]

Thank you, sir, I passed this info. on to the OP and wished him good luck.

~Dennis

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