Disable X300T Signature Check
From t-hack.com - Hack X300T / X301T
The signature check on the bootloader itself cannot be removed, since it happens inside the SMP8634. However it is possible to disable the signature check of the NK.BIN so that a modified kernel can be booted.
This modified kernel can be even a Linux kernel that is hidden inside a special NK.BIN.
Please note that this only works if there is a JTAG connection between a PC and the X300T.
download the patch tool v1 --- download the source v1