Harman Kardon Software Update Avr 1700 Harman
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The Harman Kardon AVR 1700 can also search and play audio from Internet radio stations through the included vTuner app software protocol. The AVR 1700 receivers can also stream audio using airplay. When connected to a network, the AVR 1700 also supports DLNA 1.5 Internet radio. The sleek, black front panel has a. With the AVR 1700, Harman Kardon is rethinking the budget AVR, and that means stepping away from the paradox. Yes, Harman is adding features. It edits your music library to update content identification, fills in missing cover art, and pushes music from PC to receiver. Normally, DLNA only allows you.
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I'm trying to extract firmware for the Harman Kardon AVR 1700, with the eventual goal of modifying it but mostly just for fun. (This is a networked receiver and it has a remote app that can be used to control the device. Unfortunately, it's horribly unreliable, and I'd much prefer to get shell access to the device and write some basic software to be able to control it remotely from my computer.) There's a firmware update available (EU version is numbered 170 but otherwise identical), which I installed recently. This is a fairly small file (~3MB unpacked), so I'm not sure whether it contains the full firmware or I'm just not used to the small size of embedded OS's. A file system? Not where we're going!
Browsing around using, looks like the image contains: • 0x000000 6kB bootloader • 0x010000 62kB main image • 0x100000 small mystery data section • 0x110000 large mystery data section • 0x200000 another small data section - looks kind of like image data? Opening the thing up and taking some nice photos of PCBs + chip part numbers will result in datasheets for whatever microprocessor + storage are on the device, and make reversing much easier. You could identify some things with just an image (bootloader has status print function at 0x63D4, main image printf at 0x56944) but why do it the time consuming way:) • • • • •. Thanks for the suggestions! Hadn't run into bz before, looks useful. I'm obviously a bit out of my depth here. Would you mind explaining why knowing the microprocessor/storage would make it easier to identify/extract whatever is in the mystery data sections?
As in, why would they affect the format? Also, how did you identify 0x63D4 and 0x56944 as print functions? Looking at 0x63D4 I certainly agree it looks like a little loop to copy a null-terminated string off somewhere. 0x56944 appears to deal with varargs but is too short to actually do any printing (looks like it just increments the stack pointer by 12 bytes).
Thanks for the help! Part numbers to identify what exactly all the memory mapped peripheral stuff is; those are your libraries and syscalls. General component layout, too, to figure out what external components it's talking to via those libraries/syscalls. If you want to do fun stuff to the device beyond editing strings/pictures, you'll need 'em.
On closer look it looks like covers everything needed for the STM32 F4 line. Seems to at least partially match the firmware, so I guess the part number isn't too important. 3MB is a bit much for internal storage on an STM32, some of the firmware upgrade image probably gets written to something external. Hm, find comms interface used to do so, walk up to read/write code, then get lost in whatever the image/audio routines are?
At a glance, code doesn't seem to be using the SPI registers, but is doing some bitbanging with unrolled nop-loops around 0x805674A. Ehh, this looks time consuming, fully reversing the boot process (especially communication with external stuff) may be a better first step. I wonder if there's a static standard library for this part's peripherals?
The print functions were purely due to string arguments. Huh - that printf is a bit weird. Implementation #ifdef'd out, but arguments got left in? Does the demo work if you blindly throw the firmware in an ELF via something like the below command?
Objcopy -B arm -I binary -O elf32-littlearm --adjust-vma $((0x08000000)) --strip-all --rename-section.data=.text,contents,alloc,load,readonly,code 'AVR170_USB(V03_05A).fw' AVR170.elf If you get processor options when loading it in the IDA demo, choose cortex-m. The first 32bit value (at 0x08000000) is the initial SP, followed by a whole heap of 32bit exception vectors, the last being at +0x180. If you follow the reset exception (@0x08000004 - value of 0x0800d0c9) and turn it into code (press c on 0x0800d0c8 - LSBit is set in the exception vector table because it's thumb code.) it should give you a starting point. From a very brief look, that code is just for the USB-firmware-upgrade stuff, and it later loads an exception vector table/etc for the main app from 0x08010000 (so you want to do similar with that table). I noticed the padding to 3MB too. Based on extrwi's post above noting the STM32 string, I figured it was likely a, although nothing in that series of chips has higher than 2MB flash or 256kB RAM.
Any thoughts on where this thing might be hiding a filesystem? It has a web interface (running GoAhead web server), but I can't find any trace of the associated files in the firmware (at least, nothing that shows up in strings, and as I mentioned in OP binwalk finds no signatures for compressed files either).
Control and enhance your Harman Kardon products with this remote control and music player app. This is the centerpiece of your Harman Kardon ecosystem. Highlights: >Device Remote Control Easily control all of your network-enabled Harman Kardon products. >Music Streaming Wirelessly stream content to your Harman Kardon products. >Music Player Manage your music content with custom playlists then play and control it straight from the app.
Compatible Models: SB26, Sabre SB35, Aura, Onyx, AVR 170, AVR 1700, AVR 270, AVR 2700, AVR 370, AVR 3700, AVR151, AVR1510, AVR161, AVR1610, AVR171, AVR1710, BDS 275, BDS 575, BDS 277, BDS 577, BDS 280, BDS 580, BDS x35 and AVRs 151S, 161S, 171S, 1510S, 1610S, 1710S Visit harmankardon.com and check for the latest firmware update for your Harman Kardon product to assure compatibility with this app. Note that Harman Kardon products using wired network connections only, such as the AVR x70 Series A/V receivers and the Harman Kardon BDS x75/77 Series home theater systems need a wired Ethernet connection to your home network access point (router) in order to be discovered by this app. Control Wi-Fi-enabled products such as the AVR 370, AVR 3700 by connecting the product to your home network via wire or wirelessly. The remote functions well but the fact that other than the playing music from your gallery, you can only use spotify to cast music when the AVR is on network mode is preposterous seeing as any 10$ bluetooth speaker would practically play anything you stream on it.
There should be added functionality for different apps such as google play music or pandora at least. The network functionality is practically useless if you can't stream on it.
I can't even use iTunes from my MacBook. Pontiac Serial Number Lookup. I deleted the app directly after downloading it because it was useless unless you lose your physical remote.