Using GRBL 1.1f with LW4. Running in to an issue. Every so often, when trying to connect, it states that “no supported firmware detected”. The only way to get it out of this is to reflash the firmware , and do all the settings again.
Has anyone else had this issue?
When it works, it work great. This has happened 5 times today.
Any help is much appreciated. Thanks in advance!! 
Oh, I should also mention that when it does this, it still connects and operates fine in LW3
Ok, this has happened 2 more times this morning, however under different circumstances. This time literally just sitting there idle. It lost connection, and will not reconnect as it does not find supported firmware. It takes a re-flash for LW4 to recognize and connect again. Again , LW3, and a terminal still connect just fine.
Very odd. @cprezzi any ideas?
@Eric_Flynn is this grbl-lpc or the arduino? Which OS? I’m starting to wonder if some other process or maybe the OS driver is eating the startup message.
@Todd_Fleming GRBL-LPC (your build I believe). Windows 7.
Funny thing is only LW4 sees it as an issue. LW3 still connects, and any terminal will connect just fine. Only LW4.
Only a reflash of the GRBL-LPC to the board will allow LW4 to connect to it after this happens. I have tried reinstalling the driver, LW4 etc. etc.
LW4 has a firmware check (welcome string in case of grbl). If not received within 2s, connection is closed. That’s for security reason.
But a reset of the board should be enough the get back.
@Todd_Fleming Either the os is eating the welcome string or it’s too late. I suggest the fitst.
Could you add a delay of 0.5 to 1s after a reset before sending the welcome string?
We can test the OS eating it: @Eric_Flynn try opening and closing your terminal several times. You should see a message from GRBL each time. Are you using PuTTY or something else?
@Todd_Fleming Putty , as well as RealTerm.
It works fine in terminal, and LW3 , just not LW4. I mean, to everything but LW4 , everything is normal as if there is no problem at all.
I will do some more testing this evening. I have smoothie running on it now , but will reflash GRBL-LPC.
@Eric_Flynn The question is if you get the welcome string each time, not if it’s working.