I've been trying to get my wkf to run for about 3 days straight. First, I had problems with my solder joins. I resoldered everything multiple times. I took a 32gb microSD card (Sandisk class 10, high quality) and formatted it to WBFS using WBFS Manager 4.0. This worked straight! I managed to update the WKF to 1.5. After a reboot, nothing worked anymore. The blue LED on the WKF was not lit but it tries to flash every second or so. And its also very dim, you can barely see it.
Fast forward, I resoldered everything - again. After that, I still had that issue. I thought, that I maybe bricked the wkf whilst flashing 1.5, so I used the 1.2 rescue iso - it worked! I used a cheapo 8gb SD card. After that, I used a 8gb micro SD card, formatted to WBFS - Nothing. Again, the problem I stated above.
I tried:
6 differend SD and Micro SD cards, from 2gb to 32gb, I tried WBFS Manager 3.0 and 4.0, I tried different computers, different cardreaders, different Operating Systems, different micro SD to SD adaptors - Nothing.
So, in conclusion:
the 1.5 update worked once
the 1.2 rescue SD works everytime (this is why I can rule out a wiring fault)
All other SD cards with any iso's don't work at all, even the SD card which has 1.2 rescue on it does not work when formatted to WBFS
I am very sure at this point, that it's a faulty WBFS file system or else, so the WKF does not recognize the SD card. I came to that conclusion, because the 8gb SD card with the WKF recovery firmware works everytime and this one was flashed using dd, so a bytewise flashing of each sector instead of file systems or else. Or maybe it's something else. Do you have any ideas? I'm just annoyed that it won't work and tired of all this

Chip: Genuine WKF
No DVD drive attached
Pin 29 to GND, permanently
Switch to the LID pins, NC
Megadrive 1.0 board, not directly attached to the port
I used <3cm 30AWG wire and checked every connection multiple times
Thanks in Advance,
Kenny