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[GUIDE] Hardware root via emmc chip (requires soldering!)

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By superkoal, Senior Member on 23rd September 2014, 11:17 AM
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So there is a guide from gtvhacker how to hook up an sdcard reader to the FireTV's emmc chip and mount it on a linux machine to put the superuser binary and SuperSU.apk to the system partition.
Link to the guide

xXhighpowerXx managed to do it and put together a tutorial on youtube, big thanks to him!
Link to his post

Also there is this detailed blog post of derPeter, I recommend reading it to everyone interested in this hardware hack. Link to the post

This requires disassembling the fireTV, soldering electronic parts and also basic linux skills (and a linux machine)!
Try at your own risk!

Also he updated the information in the GTVHacker wiki linked above, so everything you need to know is there.

MAKE SURE TO ALSO READ THIS POST, AS THERE IS A SOLID RISK OF BRICKING YOUR DEVICE IF YOU ARE NOT CAREFUL! Thanks to ingrimsch for talking to the gtv guys on IRC and providing the log.
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23rd September 2014, 11:52 AM |#2  
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VCC is shown on the first picture with the tx/rx pinout.
GND should be usable from the (usb) shield(s).
Will try it the next few days when i have time

Sammy98
23rd September 2014, 03:07 PM |#3  
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So i have to solder the 5 data lines the cmd, clk, vcc, vss points to a sdcard snifer and unplug the fire tv?

The snifer goes in the pc. Rest is software.


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23rd September 2014, 04:35 PM |#4  
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Quote:
Originally Posted by simondo22

So i have to solder the 5 data lines the cmd, clk, vcc, vss points to a sdcard snifer and unplug the fire tv?

The snifer goes in the pc. Rest is software.


Sent from my Nexus 4 using XDA Free mobile app

One data should be sufficient - according to the homepage where the pictures are
23rd September 2014, 06:21 PM |#5  
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Quote:
Originally Posted by simondo22

So i have to solder the 5 data lines the cmd, clk, vcc, vss points to a sdcard snifer and unplug the fire tv?

The snifer goes in the pc. Rest is software.


Sent from my Nexus 4 using XDA Free mobile app

Alright - just soldered as provided - the connections are fine on the pcb - connected with the sd-card sniffer pinouts, but no luck.
I used gnd from the powerr supply shield. No emmc visible in dmesg.
FireTV is not powered and only the emmc is connected to the reader. Same reader works fine with another emmc chip ...

Sammy98
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23rd September 2014, 06:29 PM |#6  
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Could it be that the electrical current wich comes from the reader (pc) is to low?
Because it have to supplied the whole fire tv

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23rd September 2014, 07:15 PM |#7  
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Quote:
Originally Posted by simondo22

Could it be that the electrical current wich comes from the reader (pc) is to low?
Because it have to supplied the whole fire tv

Sent from my Nexus 4 using XDA Free mobile app

No the reader should only power the emmc chip. Thats why we asked where to connect vcc and vss. Ground should not be the problem.
I will stop playing now as we want to watch a movie. When the pinout is clear, i will open up the ftv again

Sammy98
23rd September 2014, 08:26 PM |#8  
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But vss and vcc are parallel conected to other chips on the board so the "I" (ampere) divides maybe

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24th September 2014, 12:29 PM |#9  
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Quote:
Originally Posted by simondo22

But vss and vcc are parallel conected to other chips on the board so the "I" (ampere) divides maybe

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Jepp but how much current and ampere should be used on what pins? A perhaps 1.7V on the pin like in the pinout is not enough for me to try that und probably fry the atv

Sammy98
24th September 2014, 03:26 PM |#10  
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Have you tried whithout vcc, vss from the cardreader an powered ftv?

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24th September 2014, 04:06 PM |#11  
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Quote:
Originally Posted by simondo22

Have you tried whithout vcc, vss from the cardreader an powered ftv?

i STRONGLY advise against this, but you could measure voltages when the ftv is on, to compare to what your card reader supplies.
Also you could try the 5 data line mode.
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