Try moving the resistor so that it is only used on the wire for TP1.
We have found that some units dont like the resistor connected between power and the SD slot, the voltage drop appears to be to great and the SD card doesnt boot.
Sometimes it is necesarry to try another microSD card, from another brand, of you will.
The initialisation procedure for (micro)SD cards is not always working perfect for some SD cards. Another SD card can fix this. I did not use the resistor because a standard MicroSD card needs 3.3 Volt at Vdd pin. Only MicroSD cards with the label "LV" printed on them can work with 1.8 Volt. So for generic microSD cards, do not use the resistor, otherwise the SDcard will not do anything.
Please be aware of the orientation of your SD card slot when you start soldering it onto the Arm-switch board. Better safe than sorry, find the pinout picture of MicroSD card on internet, and insert the card in the socket, and pay attention on the pin numbers where they connect with the socket. GND and Vdd are important to connect them the right way. Otherwise you can fry components on your drone board.
What I did:
Put the drone on the table/workbench so, that gimble side is front side facing, and you look onto the board from above. Take the upperleftmost pin of JTAG and solder a thin wire on here. On the other end of this wire, you connect two more wires (so 3 wires connect to eachother, junction as you will). The two loose wire ends: On one, you solder the 1K resistor, then the other side of the resistor, solder a wire on here with a thin probe on it. You will use this to put it on the very tiny SMD resistor so select SDcard boot mode on startup/reset of the drone. If it boots fro SDcard you can take the probe away.
The other loose wire, you solder that to FB36 , the right solder point, next to connector to the SD card board.
I have used the JTAG leftmost pin, as 3.3V source, because it is much easier to solder on here. Use a fine and clean solder tip, and first ad a very little fresh new solder to the JTAG pin first, after that solder the wire on here.
Use a very good light source above the drone where you are working on, Good light - and patience - is golden for the fine work you need to do. Try to solder quickly and not keeping the solder iron too long in the solder point, it will damage a solder point or trace of the board. You do not want that.