# Boron will not connect to tower **URL:** \ **Category:** Connectivity\ **Created:** [March 19, 2020, 11:38pm UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265 "2020-03-19T23:38:33Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Acrop](https://avatars.discourse-cdn.com/v4/letter/a/b4bc9f/32.png) [@Acrop](https://community.particle.io/u/Acrop)\ **Post date:** [March 19, 2020, 11:38pm UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/1 "2020-03-19T23:38:33Z")
My Boron 2G/3G was working fine, but for unknown reasons now only flashes green. I’m using a 3rd party sim and credit is good. I also have many other devices working fine on the same 3rd party sims. Using the CLI, I’ve done a “particle update” in DFU mode. I’ve also reset the 3rd party sim credentials using the instructions [here](https://support.particle.io/hc/en-us/articles/360039741113/), which was followed by running “particle flash --usb tinker” in DFU mode. All programs seem to install ok, but I still cannot get the device into safe mode. I’ve changed antennas and 3rd party sims to no avail. I’ve run out of ideas. Any help appreciated? ---
**Author:** ![no1089](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/no1089/32/24051_2.png) [@no1089](https://community.particle.io/u/no1089)\ **Post date:** [March 20, 2020, 8:04am UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/2 "2020-03-20T08:04:53Z")
Hi there! I would suggest going through the steps highlighted here: [https://support.particle.io/hc/en-us/articles/360044518213-Troubleshooting-Cellular-Connectivity](https://support.particle.io/hc/en-us/articles/360044518213-Troubleshooting-Cellular-Connectivity) The cloud debug tool will help you see what is happening between the device and the cellular tower. ---
**Author:** ![Acrop](https://avatars.discourse-cdn.com/v4/letter/a/b4bc9f/32.png) [@Acrop](https://community.particle.io/u/Acrop)\ **Post date:** [March 22, 2020, 6:01am UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/3 "2020-03-22T06:01:47Z")
I’ve run the cloud debug tool - thanks for the suggestion! I"m not sure how to interpret the output but it does seem that my boron is in a bad way as it cannot even report its basic details like IMEA, ICCID etc. Any idea on how to proceed from here? Output below: ```auto clouddebug: press letter corresponding to the command a - enter APN for 3rd-party SIM card k - set keep-alive value c - show carriers at this location p - select MNO profile t - run normal tests (occurs automatically after 10 seconds) or tap the MODE button once to show carriers enter APN: APN set to telstra.wap clouddebug: press letter corresponding to the command a - enter APN for 3rd-party SIM card k - set keep-alive value c - show carriers at this location p - select MNO profile t - run normal tests (occurs automatically after 10 seconds) or tap the MODE button once to show carriers 0000011568 [hal] ERROR: Failed to power off modem starting tests... turning cellular on... 0000042432 [hal] ERROR: No response from NCP 0000042432 [system.nm] INFO: State changed: DISABLED -> IFACE_DOWN deviceID=e00fce689236a5088fb41e43 manufacturer= model= firmware version= ordering code= IMEI= IMSI= ICCID= 0000116434 [app] INFO: enabling trace logging 0000116435 [ncp.at] TRACE: > AT+CGDCONT? 0000126435 [ncp.at] TRACE: > AT+CSQ attempting to connect to the cellular network... 0000136437 [system.nm] INFO: State changed: IFACE_DOWN -> IFACE_REQUEST_UP 0000136437 [system.nm] INFO: State changed: IFACE_DOWN -> IFACE_REQUEST_UP 0000136441 [hal] TRACE: PPP netif -> 8 0000136443 [net.ifapi] INFO: Netif pp3 state UP 0000136443 [net.ifapi] INFO: Netif pp3 state UP 0000136446 [hal] TRACE: Modem already on 0000136448 [hal] TRACE: Setting UART voltage translator state 1 0000136540 [system.nm] INFO: State changed: IFACE_REQUEST_UP -> IFACE_UP 0000136540 [system.nm] INFO: State changed: IFACE_REQUEST_UP -> IFACE_UP 0000137450 [ncp.at] TRACE: > AT 0000138450 [ncp.at] TRACE: > AT 0000139450 [ncp.at] TRACE: > AT 0000140451 [ncp.at] TRACE: > AT 0000141451 [ncp.at] TRACE: > AT 0000142451 [ncp.at] TRACE: > AT 0000143451 [ncp.at] TRACE: > AT 0000144451 [ncp.at] TRACE: > AT 0000145451 [ncp.at] TRACE: > AT 0000146451 [ncp.at] TRACE: > AT 0000147451 [ncp.at] TRACE: > AT 0000148451 [ncp.at] TRACE: > AT 0000149451 [ncp.at] TRACE: > AT 0000150451 [ncp.at] TRACE: > AT 0000151451 [ncp.at] TRACE: > AT 0000152451 [ncp.at] TRACE: > AT 0000153451 [ncp.at] TRACE: > AT 0000154451 [ncp.at] TRACE: > AT 0000155451 [ncp.at] TRACE: > AT 0000156451 [ncp.at] TRACE: > AT 0000157451 [hal] ERROR: No response from NCP 0000157451 [hal] ERROR: No response from NCP 0000157452 [hal] TRACE: Setting UART voltage translator state 0 0000157452 [hal] TRACE: Hard resetting the modem 0000158503 [net.pppncp] TRACE: Failed to initialize ublox NCP client: -210 0000158504 [hal] TRACE: Setting UART voltage translator state 0 0000158504 [hal] TRACE: Powering modem off 0000158505 [hal] TRACE: Setting UART voltage translator state 0 0000170006 [hal] ERROR: Failed to power off modem 0000170006 [hal] ERROR: Failed to power off modem 0000170107 [hal] TRACE: Modem already on 0000170108 [hal] TRACE: Setting UART voltage translator state 1 ``` Just to add: “particle identify” fails to find a serial port which is strange because any other command in the CLI seems to be executed without error. ```auto Serial err: Error: Opening COM31: Access denied Serial problems, please reconnect the device. ``` .And closing Terra Term I get “Serial timed out” ---
**Author:** ![no1089](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/no1089/32/24051_2.png) [@no1089](https://community.particle.io/u/no1089)\ **Post date:** [March 23, 2020, 9:22am UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/4 "2020-03-23T09:22:51Z")
That is indicative of a dead modem - `No response from NCP`. Please create a ticket at [support.particle.io](http://support.particle.io) so we can organise a replacement for you. ---
**Author:** ![Acrop](https://avatars.discourse-cdn.com/v4/letter/a/b4bc9f/32.png) [@Acrop](https://community.particle.io/u/Acrop)\ **Post date:** [March 24, 2020, 6:00am UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/5 "2020-03-24T06:00:41Z")
Thanks for your help and diagnosis! ---
**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/particle/original/3X/3/2/3291e3c9351789fe8620ae5bcec8d3fec67ff221.png) [@system](https://community.particle.io/u/system)\ **Post date:** [September 22, 2020, 6:10pm UTC](https://community.particle.io/t/boron-will-not-connect-to-tower/55265/6 "2020-09-22T18:10:49Z")
Closed on September 22, 2020, 6:10pm UTC This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.