1、TB-RK3399ProD 、TB-96AI

Pre-installed Fedora28 and Android 8.1 dual system.

Fedora login user name：toybrick，password：toybrick

a. Default access to Linux system after boot up.

b. Press and hold the recovery button then boot up:

When type-c insert，enter loader mode；or it will access to Android system；click the power on button to enter sleep mode, and then click again to wake up.

c. If you don't need dual systems, or feel that dual systems take up too much space, can refer to the Flash_images section to write fedora28 separately or Android 8.1 separately.

2、TB-RK3399ProX：

Pre-installed Debian10 system.

Debian system login user name：toybrick，password：toybrick

a. Default access to Linux system after boot up.

b. Press and hold the recovery button then boot up:

When type-c insert，enter loader mode；or it will access to Android system；click the power on button to enter sleep mode, and then click again to wake up.

3、TB-RK3568X：

Pre-installed Debian10 system.

Debian system login user name：toybrick，password：toybrick

a. Default access to Linux system after boot up.

b. Press and hold the recovery button then boot up:

When micro USB or USB-A insert，enter loader mode；or it will access to Android system；click the power on button to enter sleep mode, and then click again to wake up.