Is there anyone that is able to setup a original firmware in order to add other 3g/4g/LTE/WIMax modem support? such as the following one for uboot

export BUILD_TOPDIR=$(PWD)
MAKECMD=make ARCH=mips CROSS_COMPILE=mips-linux-
export PATH:=$(BUILD_TOPDIR)/toolchain/gcc-4.3.3/build_mips/staging_dir/usr/bin/:$(PATH)
export FLASH_SIZE=4
export COMPRESSED_UBOOT=1
export CONFIG_HORNET_1_1_WAR=1

all:
    cd $(BUILD_TOPDIR)/ap121/boot/u-boot/ && $(MAKECMD) ap121_config
    cd $(BUILD_TOPDIR)/ap121/boot/u-boot/ && $(MAKECMD)
    cp $(BUILD_TOPDIR)/ap121/boot/u-boot/tuboot.bin $(BUILD_TOPDIR)/bin

clean:
    cd $(BUILD_TOPDIR)/ap121/boot/u-boot/ && $(MAKECMD) clean
    rm -f $(BUILD_TOPDIR)/bin/*

clean_all:
    cd $(BUILD_TOPDIR)/ap121/boot/u-boot/ && $(MAKECMD) distclean