Volume button on my Nexus stopped working after I dropped it on ground, so I disassembled it and found out, that volume button cable is actually soldered to motherboard in normal condition. In my case, it has detached with pads, so motherboard circuit is now broken to the point that volume button cable cannot be soldered again to motherboard (metals won't stick anymore).
Consequently, now I cannot get into recovery or download mode in case something goes wrong. Any ideas what to do? Is replacing a motherboard the only option?