Ok, here is the issue that i have. I have a P4 remote that has the dreaded not charging all the way issue. So I found a P3 pro/adv GL300A remote for really cheap. When I connect it to my phone, I cannot get any info from the remote. My phone charges and that is it. I want to link it to my P4. Rmeote won't even show me what firmware is on there. I've tried using both DJI go apps with no luck. Any info would be appreciated.