OS 10 to 7

Is it possible to install OS7 on BlackBerry Q5?

Those are BB10 devices. It would be like installing OS7 in the z10, z30 or Q10.
In other words....."no". but I'm sure someone will come along and give you a technical explanation.

Posted via CB10 with my z30

Thanks, also got an answer here: ...forums general-blackberry-discussion-f2/can-i-purchase-bb-z10-downgrade-os-7-x-time-being-770599/ (cannot post links)