PS3 JB King is the clone of PS3 TrueBle Dongle, and PS3 JB King team has released the V2.4 firmware along with an video. After this update, users will know PS3 JB King is upgradable and can support the same games with PS3 True Blue.And this is the PS3 JB King Recovery Firmware.
Source: http://www.gamekool.com/ps3-jbking-usb-dongleplaying-v36-game-from-external-hdd-p-435.html
Source: http://www.gamekool.com/ps3-jbking-usb-dongleplaying-v36-game-from-external-hdd-p-435.html