Is it possible to downgrade a kindle changing the .bin header?

DisableGraphics · 10-15-2020, 12:15 PM

I have a KT3 with firmware 5.9.2.0.1. I would like to downgrade to version 5.8.0. But, whenever I copy the firmware, it gets deleted. I downloaded (just to try) the 5.13.3 version and examined it with a Hex editor. The first 4 characters are SP01, but in the 5.8.0 version, those are FB02.

Here is the question: can I downgrade changing the FB02 header into SP01?

DisableGraphics · 10-15-2020, 01:24 PM

Forgot to mention that the 5.13.3 is not deleted and shows in my kindle as "update firmware"

j.p.s · 10-15-2020, 02:01 PM

Quote:

Originally Posted by DisableGraphics

I have a KT3 with firmware 5.9.2.0.1. I would like to downgrade to version 5.8.0. But, whenever I copy the firmware, it gets deleted. I downloaded (just to try) the 5.13.3 version and examined it with a Hex editor. The first 4 characters are SP01, but in the 5.8.0 version, those are FB02.

Here is the question: can I downgrade changing the FB02 header into SP01?

Kindle firmware updates are cryptographically signed, so no.

NiLuJe · 10-15-2020, 02:55 PM

Hint: the S stands for Sign--

.

10-15-2020, 12:15 PM	#1
DisableGraphics Junior Member Posts: 9 Karma: 10 Join Date: Sep 2020 Device: Kindle 8	Is it possible to downgrade a kindle changing the .bin header? I have a KT3 with firmware 5.9.2.0.1. I would like to downgrade to version 5.8.0. But, whenever I copy the firmware, it gets deleted. I downloaded (just to try) the 5.13.3 version and examined it with a Hex editor. The first 4 characters are SP01, but in the 5.8.0 version, those are FB02. Here is the question: can I downgrade changing the FB02 header into SP01?

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10-15-2020, 01:24 PM	#2
DisableGraphics Junior Member Posts: 9 Karma: 10 Join Date: Sep 2020 Device: Kindle 8	Forgot to mention that the 5.13.3 is not deleted and shows in my kindle as "update firmware"

10-15-2020, 02:55 PM	#4
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	Hint: the S stands for Sign-- .

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