Save the modified binary file. Use the programming software to erase the external flash chip and write the new modified file onto it.
It sounds simple, but for DIY enthusiasts building multi-room audio, physical labeling is the most effective tool. Use a label maker to put the unique ID or the local name you assigned on the outside of the project box. How to Rename VHM-314 on Your Phone (Local Only)
Critical Rule: The new name must usually be the exact same character length as the original name to avoid shifting the memory addresses, which would corrupt the firmware. If your new name is shorter, fill the remaining character slots with null bytes ( 00 in hex).
Merge to Staging. Address audit logging in a follow-up ticket (VHM-315). Vhm-314 Change Name
Once connected, most smartphones (iOS and Android) allow you to within your Bluetooth settings. This doesn't change the broadcast name for other people, but it helps you keep track of which module is in the "Kitchen" versus the "Garage." 2. Hardware Swapping (The Pro Method)
Locate the field labeled "BT Name" , "Local Name" , or "Device Name" . Delete the default string and type your new custom name (e.g., "Living Room Speaker"). Keep the name under 20 alphanumeric characters to ensure stability.
Swap the TX and RX wires. Toggle the software baud rate between 9600 , 38400 , and 115200 . Poor physical contact on the SOIC8 chip clip. Save the modified binary file
There are dozens of clone manufacturers producing the VHM-314. Two boards bought from different sellers might look identical but use entirely different chips, meaning a method that worked on one board may fail on another. Alternative Solutions
Since software-based renaming is generally locked out for the average user, here are the best ways to manage multiple VHM-314 modules or customize your project experience. 1. Identify by MAC Address
By following this handbook, you should be able to successfully change the name of a VHM-314. Remember to always follow best practices and take necessary precautions to ensure a smooth transition. Use a label maker to put the unique
Go to Bluetooth settings, connect to the VHM-314, tap the settings icon next to the device, and select "Rename."
Do not change the overall file size of the .bin image. If your new name is shorter than "VHM-314" (7 characters), fill the remaining empty character slots with null bytes ( 00 in hex). If your new name is longer, ensure you do not overwrite critical adjacent code bytes, or the board will crash.