I postponed testing for new firmware of TinyG as it had a period of active development. The development seems to have reached a stable period. I have briefly tested the newest version, 440.20. I'm running that and will adapt the code if needed. There doesn't seem to be any need, though. The new firmware works just like the older revision we have been used. No surprise, this application uses only basic CNC controller features.
In short: There is no need to update to 440.20, but there is no harm for doing so either.
By the way, Synthetos have built a easy to use firmware updating tool: https://github.com/synthetos/TinyG/wiki ... pdater-App. Again, just noting this, the firmware you have is good, no need for update that I know of.