Potential fixes for EZSP v16

[puddly]

See #682.

I believe the root cause is a missing NV3 component in the Zigbee firmware.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.46%. Comparing base (0960652) to head (9a1f904).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #683   +/-   ##
=======================================
  Coverage   99.45%   99.46%           
=======================================
  Files          58       58           
  Lines        3851     3892   +41     
=======================================
+ Hits         3830     3871   +41     
  Misses         21       21           

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