many of ESP12-(S/*) modules on amazon/aliexpress/ebay have other pinout (on silkprints they are same for available same-sized ) as on BTT used
make sure and at least take a look on position of GND and 5V pins
other pins are questionable ...
if you have/bought such - will be needed an adapter
many of ESP12-(S/*) modules on amazon/aliexpress/ebay have other pinout (on silkprints they are same for available same-sized ) as on BTT used make sure and at least take a look on position of GND and 5V pins other pins are questionable ... if you have/bought such - will be needed an adapter