# 1 - Backup file:
sudo cp /boot/script.bin /boot/script.bak

# 2 - Convert binary to text (fex) file:
sudo bin2fex /boot/script.bin /boot/script.fex

# 3 - Open the file:
sudo nano /boot/script.fex

# 4 - Search for the [uart1], and enable It:
uart_used = 1

# 5 - Save and close the file:
# Ctrl X, Y (Yes), Enter

# 6 - Convert the edited fex to binary file:
sudo fex2bin /boot/script.fex /boot/script.bin

# 7 - Reboot the system:
sudo reboot