You have the KT2 which cannot yet be jailbroken without using a serial port.
@baf's
alternative browser should work on the KT2 just fine, the problem is getting it to run since you need to be jailbroken in order to launch KUAL extensions.
Until/unless someone discovers a new closed-kindle jailbreak (or you are comfortable
running the scripts over the serial port) there is nothing you can do.