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Any possible unlock for the Fire TV Stick 4K Max?

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evil_santa

Member
Jan 14, 2020
36
32
yes that's great, I have to get my scanner fit again then I can take good pictures from the stick.
I hope that I can still find breakout points so that the emmc does not have to be unsoldered.
I trace the pads later, no time at the moment.
 
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Sus_i

Senior Member
Apr 9, 2013
1,263
515
I thought they'd have encryption with their devices. As in no encryption, would that count towards some chance for an unlockable Max?
Without encryption, we can read/write to the eMMC like evil_santa, which is good.
It will be even better, if evil_santa finds breakout pins for CLK and CMD :)
But read/write access wont be so easy like for the 4k, only for people with soldering skills.

In theory it may be possible to unlock it, but I guess the 4k Max is probably the most secure fireStick ever.
If you take an uart log, you see that this stick uses a whole bunch of fuses, seems it checks really a lot of them during boot, probably/maybe this is an antidowngrade measure, which makes a downgrade to unlockable images problematic. This means if an exploit gets written that works the most current PL/LK images, it wont work anymore if amaz. updates the images to a higher version. If you want a better chance, keep the stick always offline.
 
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niggonet

Member
Nov 13, 2012
14
4
I think Amazon will start using FBE (File Based Encryption) early as with Android 10 where it is enabled by default and tested enough. Even Fire OS 7 is based on Android 9, so there is hope that they won't use it.

Blocking updates is maybe more granular, it should be enough to just block the Amazon URLs.

But maybe we have luck with a mod without eMMC hardware flashing: Although Mediatek SoC are suprisingly secure nowadays, a bunch of vulnerabilities have been found a few days ago: https://research.checkpoint.com/2021/looking-for-vulnerabilities-in-mediatek-audio-dsp/

It's a bit similar to the powerful Qualcomm DSP vulnerabilities that were found two years ago (and which were followed by modem vulnerabilities last year). Will have a look if an exploit appears.

The HD trust level for streaming services could be a bummer though ...
 
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Skel40

Senior Member
Dec 27, 2019
286
137
Moto G 5G
@Sus_i @k4y0z I have the comparison between the 4K and the Max. The Max's shield is more secure than the 4K so be careful when removing the shield. It looks like the RX, TX, and GND are the same on the Max. We just have to wait for evil_santa to pin the board for the CLK and DAT0
 

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evil_santa

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Jan 14, 2020
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unfortunately it will take until the weekend again. here are a few more pictures that I took with my smartphone.
 

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69pede69

Member
Dec 30, 2014
5
0
What?... you can't just turn on ADB Debugging and Unknown Sources and sideload anything you want? (On the 4K Max)

On my TV with Firestick you can, but I haven't checked exactly what TV it is except that it's the 2022 model, which means it's a 2021.
 

Skel40

Senior Member
Dec 27, 2019
286
137
Moto G 5G
What?... you can't just turn on ADB Debugging and Unknown Sources and sideload anything you want? (On the 4K Max)

On my TV with Firestick you can, but I haven't checked exactly what TV it is except that it's the 2022 model, which means it's a 2021.
You can do both on the Max. Due to Android 9, (Fire OS 7) apps from unknown sources are different and are under each app permission.
 

69pede69

Member
Dec 30, 2014
5
0
You can do both on the Max. Due to Android 9, (Fire OS 7) apps from unknown sources are different and are under each app permission.
So if I don't want the box, then do you think the Max is the next best choice? I plan to plug in a 2 gig HD with a OTG adapter. Not that I'm really sure I need it.

What I really need to find out is if there are any apps that I can get the premium movie channels with, like HBO, Cinemax and the like. Like I used to do with Kodi. I have paid Netflix, Hulu and Prime and can't afford any others on my Disability income.
 

Skel40

Senior Member
Dec 27, 2019
286
137
Moto G 5G
So if I don't want the box, then do you think the Max is the next best choice? I plan to plug in a 2 gig HD with a OTG adapter. Not that I'm really sure I need it.

What I really need to find out is if there are any apps that I can get the premium movie channels with, like HBO, Cinemax and the like. Like I used to do with Kodi. I have paid Netflix, Hulu and Prime and can't afford any others on my Disability income.
The Max would be your best bet if you want to connect a hard drive. The great thing about the Max is Fire OS 7 and the ability to add USB devices as internal storage however you want! If you want more CPU go with the second gen cube! It's far more superior than the 4K Max hardware wise unless you choose a cheaper option! All your apps should be supported except the Google services. You have a ton of options to choose! IMDb for free, Plex, Tubi, etc!
 

lvpre

Senior Member
Jun 23, 2011
978
409
I just wish the firestick would utilize more adb commands. I've been unable to get adb backup and restore to work on a few apps to transfer to keep all settings.
 

JackOfOwls

Senior Member
Sep 25, 2015
108
20
I just bought one yesterday for $29 (after trade-in of my older firestick) to replace my old Firestick 2nd generation which was even slower and clunkier since the forced update earlier in the week. I bought the Max because I want smooth streaming, snappier menu response and faster opening of apps; the 2nd gen stick was woefully inadequate in this after the update. I suspect it will succeed in all these areas but I'll just return it if it's sh*t. Are there any tips I should know about the new stick or can you can point me to a thread for new owners? First thing I want to do is disable forced updates if possible.
 

Skel40

Senior Member
Dec 27, 2019
286
137
Moto G 5G
Are there any tips I should know about the new stick or can you can point me to a thread for new owners? First thing I want to do is disable forced updates if possible.
With the Max you can disable hdr permanently and control Bluetooth volume with the fire tv remote. Everything else is the same like your previous setup except for unknown sources for each app you put on the Max. Update wise, yes you can disable forced updates by enabling adb debugging in settings and installing downloader. Here's the Fire OS update blocker found here:
 
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JackOfOwls

Senior Member
Sep 25, 2015
108
20
With the Max you can disable hdr permanently and control Bluetooth volume with the fire tv remote. Everything else is the same like your previous setup except for unknown sources for each app you put on the Max. Update wise, yes you can disable forced updates by enabling adb debugging in settings and installing downloader. Here's the Fire OS update blocker found here:

Thanks for the info and the link. well, I got my Firestick 4K Max today and it runs so much better than my old 2nd gen non-4K stick. However, I am disgusted (as many others seems to be) that the new FireOS takes up more than a gig of precious internal storage than the old 2nd generation stick used. They should have at least increased internal storage. I was planning on installing the update disabler but foolishly booted my new stick up immediately to make sure it wasn't defective and was rewarded with an update first thing before even entering Wi-Fi or amazon account data. There's goes another half gig of storage :\ I'm down to just 3.5 GB and barely installed any apps. Can you or anyone recommend a good debloater so i can get some of that space back? Otherwise I really like the new stick. It's everything I expected it to be outside the stingy internal storage.

One other thing: Amazon said they'd give you a 20% trade-in on your old stick but after I filled out the info, they send me a promisary emaill for what appears to be only $3 (!) when they receive the old stick. That can't be right, can it?
 

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  • 2
    I got a bricked Fire TV Stick 4K Max and took it apart, here are the pics (each side with 2 slightly different foci):
    side1_.jpgside1.jpgside2_.jpgside2.jpg

    Do not take it apart the way I did as it is dead now, but maybe use the pics to see how to disassemble it without killing it.

    ---

    Edit: more pictures in sunlight:
    side1_full.jpg
    side2_full.jpg
    side1_part.jpgside1_part_.jpgside2_part.jpgside2_part_.jpg
  • 7
    Here is the dump
    Includes Boot0/1 from the emmc

    7
    Dumping right now.
    I'll take pictures later. can I set the dump here or does it cause trouble?
    6
    unfortunately it will take until the weekend again. here are a few more pictures that I took with my smartphone.
    4
    just a little, unfortunately I could not scan the board properly because the focus of the scanner is insufficient.
    I couldn't find the dat0 point yet, but vcc and vccq. I will stay tuned but if I have made progress I will let you know.

    Btw.
    is it possible to get into the u boot console? I found this maybe it is useful.
    2
    I got a bricked Fire TV Stick 4K Max and took it apart, here are the pics (each side with 2 slightly different foci):
    side1_.jpgside1.jpgside2_.jpgside2.jpg

    Do not take it apart the way I did as it is dead now, but maybe use the pics to see how to disassemble it without killing it.

    ---

    Edit: more pictures in sunlight:
    side1_full.jpg
    side2_full.jpg
    side1_part.jpgside1_part_.jpgside2_part.jpgside2_part_.jpg