So, dear readers, all signs point to no: blowing in the cartridge did not help. My money is on the blowing thing being a pure placebo, offering the user just another chance at getting a good connection. The problems with Nintendo’s connector system are well-documented, and most of them are mechanical — they just wore out faster than expected.
So much oxygen wasted in my youth…
You had to blow and create a little condensation on the cartridge. THAT was the key.