If you are installing hwfly/sx core on v2, you don't even need a guide.. Only soldering you need to do are sp1 and sp2 points on SoC QSB. Clip the nand module to modchip, insert QSB's ribbon into the connector and clip modchip itself to motherboard. That's it, no need to scratch the soldering mask and do any micorsoldering like OLED.
Unless you want to use OLED/lite chips on v2 (which is unnecessary since there are flashable core chips), only in that case you need to solder those 4 wires:
https://github.com/sthetix/DIAGRAM