I suspect that the drivers version was downgraded.
In my case, the drivers had already been installed before (v5.0.0.3) and Mobile Upgrade Tool's installer 'repaired' them: It is TCL's OS update utility for BB KEYone discussed here: Īccording to User Manual (which can be found in tool\user_manual directory) BB USB drivers are bundled in the installation package. Q 5.1.8, just to have a look how it works. I have installed Mobile Upgrade Tool ver.