Flysky NB4 Hardware Mod for Complete EdgeTX Support

With some hardware modifications, it is possible to run a full featured EdgeTX firmware on Flysky NB4+ radio. Natively, these radios have the following limitations with EdgeTX:

1. Similar to PL18/PL18EV, NB4+ has limited internal memory that is not big enough to carry a full SD card content. It comes with a 8 MByte sized NOR flash chip, which is sufficient for EdgeTX configuration files, but not for a full EdgeTX experience.
2. Similar to PL18/PL18EV, NB4+ cannot keep by default the date and the time. The internal printed circuit boards are prepared for real-time-clock functionality, but there are a few components are not populated by default. For this reason, RTC functionality will not work properly with EdgeTX out of the box.

Below you can find step-by-step tips of how to modify your NB4+ to overcome the above mentioned problems. Be aware that warranty will be most certainly lost when following the modification steps listed here.