T59b V5.1-8 Firmware Here

Replace logo.img (BMP 1080p, RGB565) using logo.img from stock or custom tool.

fw_update --apply /tmp/t59b_v5.1-8.img --verify --slot=b

If you want, I can:

sudo upgrade_tool ul update_new.img
sudo upgrade_tool rd  # reset device

Firmware is a type of software that provides low-level control for a device's specific hardware. Essentially, it's the software that is embedded in a hardware device that makes it function as intended. Firmware acts as a bridge between the hardware components of a device and the software that users interact with. t59b v5.1-8 firmware

mkdir sys_mount
sudo mount -o loop system.img sys_mount
# Modify contents here
sudo umount sys_mount

Repack:

make_ext4fs -l 800M -s -a system new_system.img sys_mount/

Downgrading from T59B V5.1-8 to V5.0.x is not officially supported due to partition table changes. Forced rollback requires flashing via a serial (UART) interface and will void warranties. Only downgrade if absolutely necessary. Replace logo

Improved voltage regulation during extreme heat (above 60°C/140°F), preventing random reboots. fw_update --apply /tmp/t59b_v5