Visor
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Under the standard SHPOs offenders are obliged to tell police of any internet devices, to allow access to them if police ask and to allow police to install monitoring software if they want. Some specifically require police to sign off a new device. The police aren't under any obligation to check every device - they focus on what they perceive as the highest risk. The police may well review if they should have picked this up sooner but it won't get charged thrown out. Your solicitor is best placed to let you know about problems with the interviews or forensics.
I'm not trying to tell you how to raise your son, but IIOC don't just pop up on Google play and it would be some coincidence if you bought it second hand and the person before you had IIOC considering your son's past. Have you considered that the visor isn't responsible but your son is.... The visor doesn't have to check every device by not doing so they are assuming a degree of trust in your son not to reoffend. The point of being out with probation is that you're meant to be rehabilitating yourself taking course, doing therapy, not putting yourself in risky situations and part of that is your responsibility to make the decision to a. Not have devices where there is a risk if you don't feel you can control it b. Not use those devices to reoffend. The point of rehabilitation is to provide a scaffold to them eventually living independently without restrictions and being able to not offend. You may want to think about therapy or ways that you can address responsibility and underlying issues with him.