Patching Pulse Oximeter Firmware

> As a side note: replacing the chip took longer than expected. I accidentally ordered a GD32F350R8T6, instead of the GD32F350RBT6 that was in the device originally. These two types differ in their flash sizes: 64 kB vs 128 kB. Don’t ask me why GigaDevice thought this naming scheme and this font was a good idea

An 8 looking almost exactly like a B. What a terrible idea.

The article mentions suspiciously similar looking devices on Aliexpress for less than $10, but it looks like under $3 even. This seems like a very cool thing to hack on, for that price.