Problem
After receiving the new Xhorse XSMA4YEN MLB key, an attempt was made to change its frequency to 315MHz. However, during the firmware rewrite process, the system returned an error: “remote burn failed”, preventing the update.
Cause
This issue is not related to the tool or operation process. The XSMA4YEN OEM-solution MLB key is factory-configured with a fixed frequency. It comes with 433MHz as default and does not support frequency conversion to 315MHz.
Solution
There is no workaround to rewrite or downgrade the frequency on this key. If a 315MHz key is required, the correct approach is to select a compatible MLB key model that is specifically designed for 315MHz from the start.
Conclusion
The “remote burn failed” error is expected behavior in this case. The XSMA4YEN OEM-solution MLB key is hardware-locked at 433MHz, so frequency modification is not supported. Always confirm the required frequency before selecting the key to avoid unnecessary programming issues.
Skype: xhorsevvdi.com
Whatsapp: https://wa.me/8613983756354
Whatsapp: 
Skype: