Is it possible to show verbose info on boot/respring?
There are no ways to boot 9.3.5 iOS in verbose mode I did a lot of research and even pangu can't achieve this you can Google how to verbose boot an iPad but there will be simply no answer because there isn't any release by pangu. You might even see some videos in YouTube in which some people have managed to dual boot and have verbose boot in iOS 10! But the sad part is never reveal it they might have developed the code but some might even get it from unknown sources. So you have to wait until a person or a developer releases an app which can verbose boot  iOS 9.3.5.