# Borron 2G/3G Blinking 12s blue at start, than endless blinking green **URL:** \ **Category:** Troubleshooting\ **Tags:** boron-3g\ **Created:** [March 3, 2019, 6:22pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205 "2019-03-03T18:22:00Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![user1235](https://avatars.discourse-cdn.com/v4/letter/u/9f8e36/32.png) [@user1235](https://community.particle.io/u/user1235)\ **Post date:** [March 3, 2019, 6:22pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/1 "2019-03-03T18:22:00Z")
Hello together, i have troubles again with a boron 2G/3G. Three working, one dosen’t. Observation: - Boron blinking 12s blue after reset, than switches to blinking green endlessly. What did i try: - Connecting USB in DFU mode and flashing different versions works, but does not alter the behavior. - _particle flash --usb hybrid-0.9.0-boron.bin_ - _particle flash --usb hybrid-0.8.0-rc.25-boron.bin_ - _particle flash --usb hybrid-0.8.0-rc.27-boron.bin_ - Factory reset leads to blinking pattern as described in documentation but behavior does not change. - Switching to LISTEN mode while blinking green leads to blinking blue. Android app is able to pair with device, displays mesh usage setup configuration question, but answering this question with Yes/Now resets the device ~10s after answer. App than displays dialog again but has lost connection to device. What to do here? Kind regards! ---
**Author:** ![ParticleD](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/particled/32/17016_2.png) [@ParticleD](https://community.particle.io/u/ParticleD)\ **Post date:** [March 3, 2019, 6:27pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/2 "2019-03-03T18:27:00Z")
If you have flashed user firmware to the Boron, try putting it into [Safe mode](https://docs.particle.io/tutorials/device-os/device-os/#safe-mode) and see if it behaves better. If it doesn’t, PM me the Boron’s [Device ID](https://docs.particle.io/support/particle-devices-faq/finding-device-id) and the SIM’s ICCID. ---
**Author:** ![user1235](https://avatars.discourse-cdn.com/v4/letter/u/9f8e36/32.png) [@user1235](https://community.particle.io/u/user1235)\ **Post date:** [March 3, 2019, 8:25pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/3 "2019-03-03T20:25:28Z")
Following I tried after i flashed _system-part1-0.9.0-boron.bin_ and _hybrid-0.9.0-boron.bin_ over USB successfully. To enter safe-mode: Releasing MODE button after RESET while magenta blinking gives: One short white flash, 10s blue blinking, followed by endless green blinking. I do not get the device into a state where _particle identify_ is successful. Although ttyACM0 pops up on plugged in and device powered but I’ll get: _Serial err: Error: Error: Device or resource busy, cannot open /dev/ttyACM0_ _Serial problems, please reconnect the device._ (while blinking blue). I cannot get the device into a state where I can perform setup successfully again. Device is currently unclaimed. Nothing I did altered the observed behavior described in first post. ---
**Author:** ![user1235](https://avatars.discourse-cdn.com/v4/letter/u/9f8e36/32.png) [@user1235](https://community.particle.io/u/user1235)\ **Post date:** [March 5, 2019, 7:31pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/4 "2019-03-05T19:31:00Z")
Boron is blinking blue the whole time. Setup through app does not go further than “Mesh network choice”. Yes/No both lead to reset of boron after some seconds and again blinking blue… ---
**Author:** ![ParticleD](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/particled/32/17016_2.png) [@ParticleD](https://community.particle.io/u/ParticleD)\ **Post date:** [March 6, 2019, 10:32pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/5 "2019-03-06T22:32:02Z")
Please PM me the [Device ID](https://docs.particle.io/support/particle-devices-faq/finding-device-id) and the ICCID. ---
**Author:** ![user1235](https://avatars.discourse-cdn.com/v4/letter/u/9f8e36/32.png) [@user1235](https://community.particle.io/u/user1235)\ **Post date:** [March 22, 2019, 7:56pm UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/6 "2019-03-22T19:56:07Z")
We had to ship the prototypes to the customer, therefore we just brought another boron for one of the products. 14 days later I powered the male functioning boron again, and setup with smartphone works like a charm. My assumption is that there was something wrong with the device connecting to particle cloud after unclaiming. Case closed. Kind regards! ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [March 23, 2019, 9:25am UTC](https://community.particle.io/t/borron-2g-3g-blinking-12s-blue-at-start-than-endless-blinking-green/48205/7 "2019-03-23T09:25:42Z")
> [@user1235](#): > > I powered the male functioning boron again, and setup with smartphone works like a charm. So you mean the female Boron is still dysfunctional 😉 _(sorry, couldn't resist to pick that up 😊)_