Kindle OTA firmware questions and "CB01" bundle

bulltricks · 09-25-2023, 03:29 PM

First, has anyone confirmed that OTA updates require being registered with Amazon?
My unregistered devices haven't gotten updates, and as far as I can tell the "softwareupdats.amazon.com/software/inventory2" requires "x-adp-sig" authentication.

The inventory2 URL has two components

com.lab126.eink.<PRODUCT>.os
com.lab126.eink.<PRODUCT>.app.nh

The "os" binary is identical to the version from the Amazon download page.

The "app.nh" binary does not seem to correspond to something on the Amazon download page.
KindleTool is at a loss as to what to do with it - the Bundle version is "Unknown (0x43423031 [ CB01 ])" and KindleTool complains about "Unknown update bundle version".

Does anyone know more about this download?

Tangentially, is the "SHA256withECDSA" reverse engineering taboo?

bulltricks · 10-03-2023, 03:03 PM

The CB01 file is available at: https://d1s31zyz7dcc2d.cloudfront.pr...3893730001.bin
It appears to only be 233KB, so just configuration data?

NiLuJe · 11-01-2023, 08:52 PM

I'd completely forgotten about those, thanks for the reminder in the 5.16.4 thread

.

I've just updated KindleTool with (read, e.g., convert) support for it.

It appears to be a single small ELF binary in there; and the whole thing appears to be designed for something like that, as the hash is that of the binary itself, not the tarball's.

PoP · 11-02-2023, 07:22 AM

Quote:

Originally Posted by NiLuJe

I haven't rebuilt the snapshots in forever, you'll definitely want to build the code yourself from the repo

.

(1.7.x was supposed to be a rewrite of the signing code, but I lost interest, so this'll probably stay at 1.6.5.y for ever and ever

).

Quote:

Originally Posted by NiLuJe

I'd completely forgotten about those, thanks for the reminder in the 5.16.4 thread

.

I've just updated KindleTool with (read, e.g., convert) support for it.

It appears to be a single small ELF binary in there; and the whole thing appears to be designed for something like that, as the hash is that of the binary itself, not the tarball's.

bulltricks · 11-02-2023, 11:24 AM

Quote:

Originally Posted by NiLuJe

I've just updated KindleTool with (read, e.g., convert) support for it.

It appears to be a single small ELF binary in there; and the whole thing appears to be designed for something like that, as the hash is that of the binary itself, not the tarball's.

Thank you!

That single ELF binary looks interesting, like a second stage installer.

09-25-2023, 03:29 PM	#1
bulltricks Enthusiast Posts: 29 Karma: 100000 Join Date: May 2023 Device: Kindle family	Kindle OTA firmware questions and "CB01" bundle First, has anyone confirmed that OTA updates require being registered with Amazon? My unregistered devices haven't gotten updates, and as far as I can tell the "softwareupdats.amazon.com/software/inventory2" requires "x-adp-sig" authentication. The inventory2 URL has two components com.lab126.eink.<PRODUCT>.os com.lab126.eink.<PRODUCT>.app.nh The "os" binary is identical to the version from the Amazon download page. The "app.nh" binary does not seem to correspond to something on the Amazon download page. KindleTool is at a loss as to what to do with it - the Bundle version is "Unknown (0x43423031 [ CB01 ])" and KindleTool complains about "Unknown update bundle version". Does anyone know more about this download? Tangentially, is the "SHA256withECDSA" reverse engineering taboo?

11-01-2023, 08:52 PM	#3
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	I'd completely forgotten about those, thanks for the reminder in the 5.16.4 thread . I've just updated KindleTool with (read, e.g., convert) support for it. It appears to be a single small ELF binary in there; and the whole thing appears to be designed for something like that, as the hash is that of the binary itself, not the tarball's. Last edited by NiLuJe; 11-01-2023 at 08:55 PM.

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10-03-2023, 03:03 PM	#2
bulltricks Enthusiast Posts: 29 Karma: 100000 Join Date: May 2023 Device: Kindle family	The CB01 file is available at: https://d1s31zyz7dcc2d.cloudfront.pr...3893730001.bin It appears to only be 233KB, so just configuration data?

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