my k4b was unbricked wrong kernel

yukimura39 · 07-23-2013, 03:58 AM

Hi there, Yesterday I unbrick my k4 follow the guide of geekmaster but at last when I did all steps, my kindle can't enter the main screen. I found my mistake that i used the kernel ver.5.0 instead of 4.0 (wow! I don't know how can I do this mistake). Up to now, I can't even enter fastboot mode because my PC can't recognize my kindle device by kindleselect, it only told me "pls connect ur device" omg. And I can't enter usb mode either, my kindle screen is always in black!
So how can I solve my problems, I had 4.0.0 kernel and now I only wanna enter fastboot mode. Thanks for your reading much!

HarryT · 07-23-2013, 04:01 AM

Moved to the dev forum.

knc1 · 07-23-2013, 08:31 AM

Quote:

Originally Posted by yukimura39

Hi there, Yesterday I unbrick my k4 follow the guide of geekmaster but at last when I did all steps, my kindle can't enter the main screen. I found my mistake that i used the kernel ver.5.0 instead of 4.0 (wow! I don't know how can I do this mistake). Up to now, I can't even enter fastboot mode because my PC can't recognize my kindle device by kindleselect, it only told me "pls connect ur device" omg. And I can't enter usb mode either, my kindle screen is always in black!
So how can I solve my problems, I had 4.0.0 kernel and now I only wanna enter fastboot mode. Thanks for your reading much!

First thought - Try Kubrick on it.

PS: Thanks for testing if the v-5.x firmware will work on a v-4.x device.

ixtab · 07-23-2013, 08:44 AM

A wrong (or broken) kernel alone should not affect your device's ability to start in fastboot mode.

That said, yes, try Kubrick on it.

If that also fails to get the device into fastboot mode, then you have a much bigger problem, because that would mean that you have overwritten (or erased) the device's boot loader, and possibly other vital information on it. Did you do anything else in fastboot apart from flashing the Kernel? If so, what?

If you have erased the boot loader, your only option would be to try and debrick it through the serial console.* I personally don't have any experience with that (I have two left hands when it comes to soldering), so I couldn't give any advice. But a few folks around here have been there and done that.

(*) Given the price tag of a K4 and the effort required, it may make sense to simply buy a new device instead. You could discard the old one, or maybe some of the hardcore hackers here would be interested in it.

yukimura39 · 07-26-2013, 02:32 AM

At 1st I have a good news that I was sucessed in my unbrick! Thanks for yours advices so much. My problem is unacessability to fastboot mode but in the other hand, I can try for diags mode instead! So now I using a 4.0.0 kernel. Thanks for all once again!

07-23-2013, 03:58 AM	#1
yukimura39 Junior Member Posts: 2 Karma: 10 Join Date: Jul 2013 Device: kindle 4	my k4b was unbricked wrong kernel Hi there, Yesterday I unbrick my k4 follow the guide of geekmaster but at last when I did all steps, my kindle can't enter the main screen. I found my mistake that i used the kernel ver.5.0 instead of 4.0 (wow! I don't know how can I do this mistake). Up to now, I can't even enter fastboot mode because my PC can't recognize my kindle device by kindleselect, it only told me "pls connect ur device" omg. And I can't enter usb mode either, my kindle screen is always in black! So how can I solve my problems, I had 4.0.0 kernel and now I only wanna enter fastboot mode. Thanks for your reading much!

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07-23-2013, 04:01 AM	#2
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383099 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	Moved to the dev forum.

07-23-2013, 08:44 AM	#4
ixtab (offline) Posts: 2,907 Karma: 6736094 Join Date: Dec 2011 Device: K3, K4, K5, KPW, KPW2	A wrong (or broken) kernel alone should not affect your device's ability to start in fastboot mode. That said, yes, try Kubrick on it. If that also fails to get the device into fastboot mode, then you have a much bigger problem, because that would mean that you have overwritten (or erased) the device's boot loader, and possibly other vital information on it. Did you do anything else in fastboot apart from flashing the Kernel? If so, what? If you have erased the boot loader, your only option would be to try and debrick it through the serial console.* I personally don't have any experience with that (I have two left hands when it comes to soldering), so I couldn't give any advice. But a few folks around here have been there and done that. (*) Given the price tag of a K4 and the effort required, it may make sense to simply buy a new device instead. You could discard the old one, or maybe some of the hardcore hackers here would be interested in it.

07-26-2013, 02:32 AM	#5
yukimura39 Junior Member Posts: 2 Karma: 10 Join Date: Jul 2013 Device: kindle 4	At 1st I have a good news that I was sucessed in my unbrick! Thanks for yours advices so much. My problem is unacessability to fastboot mode but in the other hand, I can try for diags mode instead! So now I using a 4.0.0 kernel. Thanks for all once again!

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