K-Touch frozen on System Diags

[nameless_soul]

Hello everyone! Pleased to meet you, I'm nameless_soul. Please refer to me as 'soul' or just 'nameless', as you wish.

So, here's the problem:
My beautiful Kindle Touch seems to be bricked on the very famous System Diagnostics screen.

What I'm using:

a)a Kindle Touch with firmware 5.1.2 jailbroken (Yifan Liu's method)
b)a windows 7 laptop
c)a micro-usb cable (default one)
d)amazon's usb-to-power adapter (for wall-charging)

What I have tried:

a)charging the device for more than 20 hours consecutively with a wall charger.
Nothing happened but the battery indicator(that orange/green light below the device) changing color.
b)pressing and holding the power off/lock button for 30 seconds (Soft reset).
Nothing happened.
c)charging the device for 5 minutes and then pressing and holding the power off/lock button for 1 minute. (Hard reset).
The battery indicator when off after 15 seconds, but nothing more. Although, when I did this using my computer as a power source, my computer recognized the Kindle as a removable device for about 5-10 seconds. When I had a chance to access its content it was empty. No surprise.
d)removing the battery.
Absolutely nothing happened.

Here's the victim:

Spoiler:

Consider me an average Kindle user with no clue about what happened to my device.
Help would be infinitely appreciated. I'm really desperate to fix this problem.

[ixtab]

Use the information from the "simple debricking" sticky thread - in particular, follow the "noob's guide" linked from there.