Table of Content
Unsurprisingly, because they are probably the most carefully written parts, I haven't been able to find any way to skip the secure boot from this side. It was now time to actually have a look at the content of the NAND Flash dump. I guess this nibbles swapping weirdness is caused by the way the low-level hardware BCH engine is actually working. A glance at the bootloader/berlin_tools/bootloader/nand_ctrl/mv_nand.c file is enough to understand the ECC is calculated by the hardware of the main SoC itself. The NAND Flash hardware peripheral of the processor is fully responsible from computing it.
The Interposer board, soldered on the Google Home Mini PCB, ready to be used. To help with the soldering process, I ordered a stencil at the same time with the Interposer PCB. The holes of the stencil are matching the NAND Flash footprint. As it must be soldered like a BGA component, I'll turn it into one by soldering tiny solder balls.
Installing NandBug on the Google Home Mini
Of course, using 2.54mm connectors may cause signal integrity issues when dealing with high speed signals. However, looking at the Flash datasheet, it appears the maximum speed was not that fast, and I chose to take the risk. Receiving and transmitting data to and from the NAND Flash. This is done using the Synchronous FIFO mode of the FT2232H.
It almost feels like having your own J.A.R.V.I.S doing your bidding. Throw in some smart lights and a few other gizmos and you’re on your way to a smart home. Being the first generation old tech that it is, don’t be surprised by the Micro-USB port. The Google-branded power adapter that comes with plugs into a socket.
Making sense of the NAND Flash Dump
Prevents Google Home Max from listening or responding. To interact with Google Home Max, the microphone must be on. Stop a ringing alarm or timer Tap the center of the Nest Mini. Google Home App can also be used here by going into the settings and scrolling down to Device Settings. Despite the fact, the competition in the market in the face of Alexa or other gadgets can somewhat blunt the appeal of the Google Home Mini. And suppose you finally decide to swap the Google Home Mini for any other device.
If you don't hear the chime after tapping and holding the center of the Nest speaker, you can try this alternative reset method. Actually completing the reset is fairly easy to do, but you'll want to determine what generation model you have first. Google Home Mini and Google Nest Mini have some differences but look very similar. One of the most significant differences between them is the method used to perform a factory reset. It’s a problem that smart speaker companies are still solving.
Google Nest Mini (2nd gen)
For instance, keeping track of the Google Home Mini firmware releases becomes relatively easy. Further, attempting to run arbitrary code on the device from the NAND Flash becomes possible. My goal is not only to read but also to alter the NAND Flash data to achieve code execution. Hence, the ECC of all modified pages must be computed. Otherwise, the Google Home Processor will simply discard all the modified pages.
Then, try resetting the smart speaker, as shown above. If successful, the device will begin to reset after 5 second. Continue to hold till you hear a three-tone chime confirming the device is resetting. If you have a Google Home, press and hold the microphone mute on the back of the speaker for about 15 seconds to reset. If successful, your device will confirm it's resetting.
I also don’t get Nest Aware either and it’s not from lack of trying. These apps don’t support most regions outside their privileged enclave in the Northern Hemisphere. While Netflix shows up in my Google Home app, I can not use the Google Home Mini to play anything on Netflix due to geo-restrictions.
I sadly realized the Google Home Mini was not booting anymore. I quickly understood how naive I was by reading the init.rc script from the Kernel initramfs. In order to mount and eventually alter the content of these partitions, I choose to use the exact same YAFFS2 driver that can be found on Google's shared files. Please note the Kernel version, sources, initramfs and init.rc file will be useful in the second part of this series of article. The Linux Kernel version and compilation timestamp can be extracted from strings present in the binary data. Swap another time the nibbles of the computed BCH code.
Normally, performing a factory reset is a tried and true way to resolve an issue . But that may not fix your affected Google Home or Mini this time. Try it first, just in case it works, and so you can check it off the list of things you've tried to do to troubleshoot the problem on your own. You want to rule out that some other hangup isn't causing the problem.
You’ll need to invest some time and effort if you want to see that payoff come full circle. Keep in mind that you might have to wait an extended amount of time before a customer comes along and makes an offer on your product. If you’re ready to walk the extra mile, we believe you’ll earn a better return on investment. After resetting, you will be able to set up the Google Home Mini as if it just came out of the box. Once you're finished, you can start using the full list of commands again. Here's how to factory reset your Google Home or Nest Mini to fix problems and get it working like new.
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