4/9/2024 0 Comments Edit arm bin file![]() ![]() ![]() ![]() This is the place where the ARM CPU will start code execution. The difficulty is that you have to start the analysis on your own.īut this isn’t as bad as it might sound in first place. This is normal if you are analyzing firmware images in IDA Pro. Did you do something wrong? Most likely not. No auto analysis as usual, no code, just a lot of hex. The first view on IDA will be rather odd. Thanks to Igor for pointing this out! Binary Structure There is a little trick regarding the main flash, it seems the first 0x4000 are taken by the bootloader so our binary has to be located at 0x8004000. If you encounter a reference which are backgrounded in red during your journey, it is very likely that you miss another segment. There are many more segments used by the CPU. Simple isn’t it? All you did above is relocating the file/image to the correct location taken from our datasheet. Normally the RAM size and ROM size don’t need adjustments. Press Ok on the “ Load new file” dialog and you will be presented with the dialog as shown below. This is the memory location mapped to the physical ROM, so we map our file to this address. The ARM CPU used in our target device will require the image to start at offset 0x8004000. If this step is skipped, cross references will be broken and disassembling the file won’t work properly. Since the CPU won’t load the image from 0x00 where it starts in the file we have to relocate it. The firmware image is loaded into the ROM section of the IDA database. Let’s proceed to the next step and relocate the loaded firmware image to it’s correct offset. Now you are done with the basic CPU settings. Since Cortex-M is thumb only, so no further thumb related settings are needed here. The middle pane can be found by pressing the “ Edit ARM architecture Options” button within the “ Processor options” menu. Look at the screenshot below for the best settings. Therefore we have to change the processor options accordingly. We learned that this devices use an ARMv7E-M based CPU. The next step is making some settings to the processor options. No disassembly required.ĭon’t press “ Ok” just yet. This document should provide you a lot of interesting information. Most of the time you will find a document labeled “ internal photos“. Do a search for the manufacturer with the FCC directly or in an independent database. If your device was FCC approved, there should be public information about it available online. This can be easily looked up by disassembling the radio and taking a look at the chips inside.Īnother more convenient way is to ask the FCC. The series of ANYTONE 878 radios is based on GigaDevice GD32 ARM Cortex-M4 microcontrollers. ![]() So we can simply load the CDD in IDA Pro. The file’s metadata is split into separate files. It is simply an image of the internal flash memory and it doesn’t even carry a file header. We are quite lucky here, since the firmware image is not encrypted of otherwise protected. The CDD is the largest of the files and this is actually the firmware image we need. Now I've got official android pie running flawlessly.Within the update package you will find the FW folder, which contains three files. I had to wait around 5 min after every big image was flashed, so just be patient, Total time flashing: around 30 mins. Sending sparse 'system_b' 4/4 (483657 KB) OKAY Sending sparse 'system_b' 3/4 (524286 KB) OKAY Sending sparse 'system_b' 2/4 (524285 KB) OKAY Sending sparse 'system_b' 1/4 (524286 KB) OKAY img being flash:Ĭ:\Users\adair\Documents\MiA2\10.0 ota dump\images>fastboot flash system_b system.img If you run "fastboot flash system_b system.img" the fastboot windows seems to be freezed, don't worry it is actually doing something xD, " JUST WAIT ENOUGH" and you will get the next. Sending sparse 'system_a' 4/4 (483657 KB) OKAY Sending sparse 'system_a' 3/4 (524286 KB) OKAY Sending sparse 'system_a' 2/4 (524285 KB) OKAY Sending sparse 'system_a' 1/4 (524286 KB) OKAY Invalid sparse file format at header magic If you needed root you can flash patched_boot.imgĭon't worry, I got it, the answer was all the time on the first post.Īfter running fastboot flash system_a system.img you get something like this: If you see " invalid sparse file format at header magi" when flashing system and vendor, ignore it and wait. Fastboot flash mdtpsecapp_a mdtpsecapp.imgįastboot flash mdtpsecapp_b mdtpsecapp.img ![]()
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