I purchased a used P4 on eBay. Got it in, and was able to update the firmware through the micro-USB port attached to my computer after two failed attempts with my iPhone running the DJI app. Couldn't update controller firmware via either method (I tried two different iPhone cables thinking one...
If you want to troll with the drone until something bites, all you need is a line release. I'd say set it around 2 lbs. $10 on Amazon:
https://www.amazon.com/Cannon-2250009-Universal-Line-Release/dp/B000MMVW80/ref=sr_1_4?ie=UTF8&qid=1522286871&sr=8-4&keywords=line+release
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