4 T5 screws at the back, then use a pick to pry the shell off via the microSD slot. remove green ph00 screws, leave yellow. remove shield. Remove yellow ph00 screws, un-plug purple cables, lift black ribbon socket latches and carefully slide them out. I accidentally ripped my left joystick ribbon doing this, but thankfully you can replace them with Nintendo Switch joysticks. The rubber caps can be shoved through the Retroid frame with a tiny bit of dish soap as the cap is slightly larger than OEM. Carefully pull up the battery. It is adhered directly to the kapton tape that is preotecting the large ribbon cables below it which is not repair friendly, but you can push down on the tape as you start to get the battery up so that the cables don't get damaged. The tiny blue and red cables for some sort of sensor attached to the back of the display are easy to pull off here, and they need to be de-soldered anyway to detach the motherboard from the front assembly. I watched some videos on how to de-solder USB-C...

One of my kids' ports is also broken, I contacted Retroid just before the weekend and am planning on disassembling his unit to check it out. I'll post what they say, but I'll bet they treat these as a new board replacement (which is a problem since they no longer even have the 3 or the 3+ upgrade PCB in stock). I'm thinking that this one from Sparkfun might be a match, as it looks like a four through-hole stabilized surface mount C port: https://www.sparkfun.com/products/15111 I'll post more once I can take a look at the front of the board, I can't find my magnet sheet or pen, and there's no defined guide for this device yet - which makes me sort of want to spend the time making a guide with some photos as I go. I'm just tight for time.