CM-T3730: U-Boot: Firmware Update
Introduction
The CM-T3730 firmware consists of two files that reside on the first partition of the micro SD card:
X-Loader
To update the X-Loader, just replace the X-Loader binary file (MLO) on the MMC/SD card with the newer version.
U-Boot
To update the U-Boot, just replace the U-Boot binary file (u-boot.bin) on the MMC/SD card with the newer version.