tcrevenge + new scripts

Hacking TrendChip Firmware FG824CD (ADSL modem/router *****v4)

WARNING!

NOT USE WSL/WSL2!

If you are here, then you know what you are doing!

I am not responsible for your bricks!

1. Be sure to install the following utilities before proceeding:

sudo apt install git make libarchive-zip-perl binwalk squashfs-tools qemu-user-static

2. Clone repo and make a tcrevenge:

cd ~
git clone https://github.com/MilkAlien/tcrevenge.git
cd tcrevenge
make

3. Copy stock image to '~/tcrevenge/'

4. Unpack stock image:

sudo sh ./unpack-img.sh

5. Edit '~/tcrevenge/squashfs-root...'

5.1. QEMU test squashfs-root

sudo mount ./rootfs/rootfs.img ./squashfs-root/mnt/rootfs
cd ./squashfs-root/
sudo cp /usr/bin/qemu-mips-static .
sudo chroot . ./qemu-mips-static bin/busybox sh

5.2. !!!----and qemu chroot an clear----!!!

exit
cd ../
sudo umount ./rootfs/rootfs.img
sudo rm -rf ./squashfs-root/qemu-mips-static

6. Making a new firmware!

6.1. Copy '/tcrevenge/kernel/(your_version)/kernel' to '/tcrevenge/'

cp ./kernel\(sc3.0.16\)/kernel ./

6.2. Repacking custom image:

sudo sh ./repack_squashfs.sh

7. Completed! Take a new image '~/tcrevenge/youre_version.img'

If '6.2' gives errors, run the following commands in terminal one by one:

sudo mksquashfs squashfs-root/ gpon.squashfs -comp lzma -b 131072 -nopad
./tcrevenge -k kernel -s gpon.squashfs -o header -sp
cat header kernel gpon.squashfs > firmware.0
size=`stat firmware.0 -c %s`
ver=`cat squashfs-root/etc/fw_ver`
crc32=`crc32 firmware.0`
crc32_10=`printf '%d' 0x$crc32`
d0=`date +%a`
d1=`date +%b`
d2=`date +%d`
d3=`date +%T`
d4=`date +%Y`
d5=`echo $d0 $d1 $d2 $d3 $d4`
# echo $size $crc32 $crc32_10 $pid $ver $d5 $d6
echo -n 'kernel_rootfs' >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
echo -n $size >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
echo -n $ver >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
echo -n '1002' >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
echo -n $crc32_10 >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
echo $d5 >> header2
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header2
cat header2 header kernel gpon.squashfs > firmware
gzip firmware -n
pid=`cat squashfs-root/etc/pid`
sha256=`sha256sum firmware.gz | awk '{print $1;}'`
sha256_ascii=`printf $sha256 | xxd -ps -r`
echo $pid >> header3
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header3
echo -n $sha256_ascii >> header3
echo -en '\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00''\00' >> header3
cat header3 firmware.gz > $ver.img

Original branch by vasvir >> https://github.com/vasvir/tcrevenge