IMPORTANT: The process here is for apollo IMPORTANT: Use the thor firmware if you have that device

Requirements:

1. synaptics_fw_updater
2. Synaptics.3.B.apollo.img from the kernel source
3. Reboot into recovery (twrp)

Method: (This works using linux)

1. Push synaptics_fw_updater to /data

adb push synaptics_fw_updater /data

2. Push firmware to /data

adb push Synaptics.3.B.apollo.img /data

3. Change permissions of synaptics_fw_updater

adb shell
cd /data
chmod 777 synaptics_fw_updater

4. Flash the firmware

./synaptics_fw_updater -v -f -b Synaptics.3.B.apollo.img

5. Reboot and voila touchscreen should be good.