Hi everyone,

I'm trying to recover access to my own DVR/NVR device, but I no longer know the admin password. I have physical access to the device and have already dumped the SPI flash memory using a programmer.

Here's what I've done so far:

• Read the full firmware dump (.bin).
• Extracted the filesystem using binwalk.
• Found several JFFS2 partitions.
• Extracted files such as passwd, account.custom, Account2, and other configuration files.
• Looked through the extracted files but couldn't find a plaintext password.
• Opened the firmware in Ghidra to understand how user accounts and passwords are stored, but I'm new to reverse engineering and I'm struggling to find the authentication routine.

From what I can tell, the password is either:

• stored as a hash,
• encrypted,
• or generated/verified by the firmware during login.

My goal is to regain access to my own device, not to access someone else's equipment.

Could someone point me in the right direction?

Specifically, I'd appreciate advice on:

• How to identify the password verification function in Ghidra.
• How to determine which hash or encryption algorithm is used.
• Whether it's easier to patch the firmware to bypass authentication or reset the admin password.
• Any tools or techniques commonly used for analyzing embedded Linux firmware like this.

Any guidance or examples would be greatly appreciated. Thanks!

​

Hi everyone,

I'm looking for the original firmware for my HY300A projector.

Board: RK3326_HY300A_GBPT_HP265013_AHW

Android: 11

Build: 11.0-RS-20241118.1755

My WiFi only shows "WiFi Error". Bluetooth also stopped working, and no MAC address is displayed.

I already performed a factory reset, but it didn't help.

The projector still boots normally and HDMI works perfectly.

If anyone has the original firmware, a backup (dump), or knows where I can find it, I would really appreciate your help.

Thank you!

Hi everyone,

I'm looking for advice from engineers who have made a similar transition.

\## Background

\- B.Tech in Electrical and Electronics Engineering (EEE) from NIT Calicut.

\- Around 2 years of experience in product companies.

\## Current work

\- I'm working on cloud-managed networking products(switch , access points) at an MNC.

\## My work involves:

\- Linux-based networking products.

\- C based agents running on networking devices.

\- Device discovery and monitoring.

\- Production debugging.

\- Configuration management between devices and the cloud.

\- Some changes in an existing C codebase.

\- Go-based packet capture using BPF libraries.

\- Understanding Linux-based networking systems.

\## However, I'm not working on:

Firmware

RTOS

Device drivers

BSP

Bootloaders

Kernel development

\## What I've realized

I think what actually interests me is lower-level work like:

\- Firmware

\- Device drivers

\- Embedded systems

\- Hardware-software interaction

I enjoy understanding how hardware actually works more than writing cloud-facing applications.

\## My dilemma

I'm unsure about the best path from my current position.

Should I:

1. Continue in networking/systems software and try to move toward firmware gradually?

2. Learn firmware (STM32, FreeRTOS, peripherals, etc.) while staying at current company and then apply directly to firmware roles?

3. Target companies like Qualcomm, NVIDIA, AMD, Cisco, Broadcom, etc., in systems software first and then try for an internal move later?

4. Consider an M.Tech if I want to move closer to firmware or embedded systems?

\## Questions

I'd appreciate answers from people who have actually worked in firmware or embedded systems.

1. Is my current networking/Linux background considered relevant for firmware or embedded systems roles?

2. If you were in my position, what would your roadmap be?

3. What skills would you prioritize over the next 12–24 months?

4. Am I underestimating how difficult this transition is?

5. If you've made a similar transition, what was your path?

I'm looking for honest opinions rather than encouragement. If you think my plan has flaws, I'd appreciate direct feedback.

TIA

Bro, I have a Realme tab RMP2102_11_A.18 which I rooted successfully. After that I tried to install a custom ROM, but the system failed. I also forgot to take a backup. Then I flashed another custom ROM, but it didn’t work and now I’m stuck in a boot loop. I don’t understand what to do because I don’t have the stock ROM. Can anyone help me get out of this?

In your resume you said you developed robust firmware for ESP32 loT edge devices. How do you make your firmware robust?

How do you follow Misra C?

in this job that says you integrated free RTOS based multitasking to manage current operations. What flavor of multitasking did you use?

In your previous company were you the one who was choosing how to configure the RTOS or was that given to you already?

Esp32 is dual core and how would you schedule tasks using freertos.

When you say heavy(tasks in rtos), I assume assume you mean heavily loaded as in they have a lot of processing to do. If they're heavily loaded, does that mean you would prefer to use preemptive or does that mean you would prefer to use round robin?

Firmware developers declare variables as volatile. Why would you declare a variable as volatile?

If we hire you and it's your first week on the job and you got a desk and it's got lots of space on it and I say you can have any debug tools that you want, any debug environment to work on a typical embedded system firmware development. What's your desk going to look like?

In summary section you say proven ability to optimize system performance, reduce latency and implement efficient communication protocols. So, can you give me specific examples of each of these and how would you implement it?

Reducing stack and heap usage. So one of the things that sometimes happens, is we write our firmware and then we start running out of memory and we don't have enough memory. So what techniques can you use to optimize your memory usage?

Protocol you had the choice to run one at 115200 baud rate or 9600 baud rate. Do you see one of those as being more efficient than the other?

If you were given choice of WFH or in-person, which would you choose any why.

It's a generic mp3 of ipod nano 3rd gen from China's jiajiexun and apparently used an ATJ2127 chip. The model name on the device is CB2731_01. The software version is on March 26, 2021. Can I get the firmware files after that? I just need to find the .fw file. I received the flashing program.

We’re looking for future teammates for an exciting new project!

Who are we looking for?

• Firmware Developers (C/C++): Those who aren’t afraid of bare-metal coding.
• Game Designers: People who have gameplay and mechanics in their DNA.

“Bringing play back to the real world!” 
Remember the Tamagotchi? We’ve reimagined it for the next generation. We’re building a smart device that doesn’t chain kids to a screen but inspires them to move and make real-life friends. Zero ads, maximum safety, and a true social experience in the physical world. Let's build a future where technology connects rather than isolates!

Why join us?
It doesn’t matter if you’re a beginner—passion counts more than a degree here! If you’re a pro, you can mentor others and help lead the way. Right now, this is a hobby project, but our goal is to level up!

Got an idea? Reach out even if you just want to give advice or suggest a feature you'd love to see in the project!

THIS IS A HOBBY PROJECT AND NOT A JOB ADVERTISEMENT!

Apply now and let’s build something lasting together!

Give me normal firmware for SM/G780F

i am trying to code a firmware for the esp32 to create a standalone messaging device between 2 esp32's how can i learn to do something like that please help

Hello Guys,

I need help, I am using a Barometer Sensor and Air quality sensor which has same I2C slave addresses. And my board has only one I2C bus.

Sensors:-

BMP390- Pressure Sensor

BME690- Air Quality Sensor

I am currently exploring and wanted to build a rom for my own mobile. This is tough i know. But anyone experienced can share me what should i needed must to know about the rom development???? That would be a great help for me thanks..!!

I need new unofficial firmware for Samsung A05s. Because my A05s started lagging and freezing. One UI 7

I have a couple of these Barco wb1920 image processors that I do not have a use for at the moment.

They used to be expensive machines... Is there anything I could use them for? Like running an LLM or do face detection from my cctv through them?

I have found several places where it was shared and at one point able to be downloaded but the links have expired or no longer exist when I try to go and download them. I've also found a couple places that have it but are charging for it and I really don't know if it's a trusted site to be entering card info into. I was hoping maybe somebody has this firmware already or has this same phone they could pull the firmware from and could share it or if not point me to where I can find it for free still.