# gSender won't connect **URL:** \ **Category:** 🐛 Bug\ **Created:** [October 24, 2021, 4:25pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966 "2021-10-24T16:25:30Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Psal217050](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@Psal217050](https://forum.sienci.com/u/Psal217050)\ **Post date:** [October 24, 2021, 4:25pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/1 "2021-10-24T16:25:30Z")
I added limit switches, got gSender 7.5. Flashed the firmware update. Set the parameters to the instructions for the limit switches. I hit the Home button in the upper right, it went through and then I had a unlock screen pop up. Then nothing moved, no matter the direction. I disconnected and reconnected, or tried to connect and now get the following message. "error openting port ‘/dev/ttyACM0’. I am using a Raspberry Pi 4 and could use some help in getting this operating again. ---
**Author:** ![NeilFerreri](https://forum.sienci.com/user_avatar/forum.sienci.com/neilferreri/32/1959_2.png) [@NeilFerreri](https://forum.sienci.com/u/NeilFerreri)\ **Post date:** [October 24, 2021, 5:24pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/2 "2021-10-24T17:24:19Z")
Unplug USB, replug and try again. ---
**Author:** ![Psal217050](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@Psal217050](https://forum.sienci.com/u/Psal217050)\ **Post date:** [October 24, 2021, 5:43pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/3 "2021-10-24T17:43:10Z")
I did, it reconnected, but nothing is moving. It said click to home (red), then homing (green) and can’t get it to move in any direction. Even tried reflashing the firmware. I even tried CNCjs and the machine won’t move now. ---
**Author:** ![NeilFerreri](https://forum.sienci.com/user_avatar/forum.sienci.com/neilferreri/32/1959_2.png) [@NeilFerreri](https://forum.sienci.com/u/NeilFerreri)\ **Post date:** [October 24, 2021, 5:50pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/4 "2021-10-24T17:50:46Z")
No errors popping up? Anything in the Console? ---
**Author:** ![Psal217050](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@Psal217050](https://forum.sienci.com/u/Psal217050)\ **Post date:** [October 24, 2021, 6:12pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/5 "2021-10-24T18:12:00Z")
No. My feeble brain can’t figure it out. I was thinking of hooking up a laptop but I think it is something in the firmware or maybe even the longboard and whether it’s RP4 or Windows won’t make a difference . ---
**Author:** ![Psal217050](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@Psal217050](https://forum.sienci.com/u/Psal217050)\ **Post date:** [October 24, 2021, 7:01pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/6 "2021-10-24T19:01:59Z")
I reflashed firmware again. And whatever it did worked. Machine is operational and homes to left front corner. Now to figure out work offsets. ---
**Author:** ![NeilFerreri](https://forum.sienci.com/user_avatar/forum.sienci.com/neilferreri/32/1959_2.png) [@NeilFerreri](https://forum.sienci.com/u/NeilFerreri)\ **Post date:** [October 24, 2021, 7:04pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/7 "2021-10-24T19:04:46Z")
> [@Psal217050](#): > > And whatever it did worked Not sure what you might have changed, but glad you’re in business. ---
**Author:** ![Psal217050](https://forum.sienci.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@Psal217050](https://forum.sienci.com/u/Psal217050)\ **Post date:** [October 24, 2021, 7:10pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/8 "2021-10-24T19:10:40Z")
It’s strange, the settings in the firmware look different. I will check them out and write them down to keep later when I turn it on again. Time to watch football. ---
**Author:** ![chrismakesstuff](https://forum.sienci.com/user_avatar/forum.sienci.com/chrismakesstuff/32/10759_2.png) [@chrismakesstuff](https://forum.sienci.com/u/chrismakesstuff)\ **Post date:** [October 25, 2021, 5:10pm UTC](https://forum.sienci.com/t/gsender-wont-connect/3966/9 "2021-10-25T17:10:24Z")