Downgrading firmware with Bose Update v7.1.7.5136 about ced

[jefro108]

Using a Mac the instructions are similar
Tested on macOS Ventura 13.4.1, with NC700.
Bose Update version is 7.1.7.5136.

1. Open https://btu.bose.com/ and download the Bose Updater.
2. Install the Bose Updater.
3. Close the Bose Updater if automatically executed.
4. Open Terminal and run Bose Updater with -d option: '/Applications/Bose Updater.app/Contents/MacOS/Bose Updater' -d https://raw.githubusercontent.com/bosefirmware/ced/master/lookup.xml
5. Open https://btu.bose.com/ again. (You can use the 'Launch Bose Updater Webpage' option from the Menu Bar)
6. Enter advanced mode ('a', 'd', 'v', 'Arrow up', 'Arrow down').
7. Now you can select the version to proceed.
   
8. Click "Update Now" to downgrade.

[Bhaalgorn]

not working on the latest version 7.1.13.5138
shows "unknown option 'd' "

[zhangjiesg]

good

[mlazzje]

Thank you @kukdh1 !!!

[kukdh1]

Wow, it looks like BOSE is tracking this repository 😲
The option name has been changed to different one, and I think it is better to not disclose it.

You can find it by yourself:

1. Decompress executable (BOSEUPDATER.exe) using upx.
2. Open with hex editor (e.g., HxD) and search for url.
3. You will find few words after url, delimited by non-alphanumeric characters. Try them as an option name (with two hyphens).
4. If you got error saying "missing value for the option", that should be the answer.
   (Of course, you can disassemble the code instead of brute-forcing.)

[Canawan]

Hello sir, I have a bose quietcomfort earbud and want to downgrade the firmware, can you make a more detailed guide, because I'm not very good with technology