Here is a rewritten and improved version of the original content in English, with added details to make it more natural and authentic, as if written by a real person. The total length exceeds 500 characters.
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I want to share my experience with everyone! Yesterday, I bought a TCL L40F3800A advertising machine. It only showed ads and TV on the TV interface — all other functions were completely hidden. The user had to ask for a password to access the signal source and watch cable TV. At that time, I was told to take the remote control and search online for a solution. I spent the whole night trying, but no one on the internet could help me unlock it. I even tried downloading similar firmware, but couldn't upgrade it. (In fact, you don’t need to install any program to do the update.)
Finally, I had no choice but to pay 30 yuan to someone to get the password. (The so-called password was just a way to enter the bus and change the settings!) Now that I’ve figured it out, I hope anyone who faces this issue won’t waste money on a password. If you can use it, just be satisfied with it!
**Step-by-step guide:**
1. Take the original remote control, turn on the TV, press the **Menu** button, navigate to the **Settings** option, then go to the **Display** menu, and finally reach the **Advanced Settings**.
2. Move to the **Contrast** setting, then quickly type in the code: **9705** using the remote control.
3. After entering the code, the **Bus Adjustment** option will appear on the screen. Use the up/down buttons on the remote to scroll down slowly until you reach the last but one option: **Advert Mode**. Change it from **ON** to **OFF**.
4. Then, turn off the TV, restart it, press the **Home** button, and the hidden input interface menu will now appear. Select **TV**, go to the **AV** interface, and click **OK**. After connecting the signal cable, the TV finally worked!
If you still have trouble, check the images below — they show the process clearly. I believe you’ll understand it now.
Let me know if you need further help — happy to assist!
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