if the software is actually on your iphone and not working, and you bought it on the apple store, first turn off updates for it. Go to strelock's site, they have instructions for restoring it on your phone, you must have updates turned off. If it were me, I wouldn't do it since you have to use another software and your appleid login. If you do do it, instantly change your appleid credentials. I don't trust anyone. I still wouldn't do it myself.
How much the second hand - or - older model droid tablets cost? I am using a Samsung tablet when at the bench, and like the big screen very much... fully loaded with Strelok, FX radar, Weathermeter, measuring hits, and a lot more.