The AFBxx and FBxx are ferrite beads. worst case, you can replace them with zero ohm resistors.
I bought 2 failed blades with the same trouble and managed to get them back to life.
The best way to solder  themthose parts is with an hot air station.
I posted a few pages ago a step by step guide to check what is failed on a blade.
Follow it, and post your results.
Obviously, you will need to replace the FB before testiong the usb part of the board.
You may also have to replace AME8805 chip.
If so, they are selling either on utsource or ebay for cheap, and I also have a few ones I can send for the price I paid them from utsource + shipping from France.

Worst thing that could have happened is the STM32 chip fried since we don't have the firmware for it.
I'll try to extract it, but not sure when.

when the STM32 chip is fried, you will get low voltage at the output of the AME8805 instead of 3.3v, and the capacitors next to the crystal will read either zero or infinite when using the ohm-meter. I can't remember which value it was.
Soldering the STM32 is not easy at all, i took me some time to get all pins correctly aligned.

If you got no reply within 2 days, just PM me, I'm quite busy at the moment.


And when/if you revive the blade, just lower the resistor from 43k to 39k, the extra power draw isn't worth it anymore.