# Bed Level Failure Taz Pro/LED Blank after Firmware Flash **URL:** \ **Category:** LulzBot TAZ\ **Created:** [October 11, 2023, 10:25pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058 "2023-10-11T22:25:21Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![equality2112](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@equality2112](https://forum.lulzbot.com/u/equality2112)\ **Post date:** [October 11, 2023, 10:25pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/1 "2023-10-11T22:25:21Z")
Hi, Tried to fix a bed level failure (continuous loop) with and now my Taz Pro Dual Extruder and not connecting after software update and firmware flash (lost connection during the update). Now the LED is blank. UGH! Any help is appreciated. ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [October 11, 2023, 10:27pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/2 "2023-10-11T22:27:38Z")
Power cycle the printer and try flashing the firmware again. ---
**Author:** ![Wrathernaut](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/wrathernaut/32/13542_2.png) [@Wrathernaut](https://forum.lulzbot.com/u/Wrathernaut)\ **Post date:** [October 11, 2023, 11:29pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/3 "2023-10-11T23:29:12Z")
The firmware flash should still work from cura le. Just make sure another program isn’t trying to use the com port while you flash. ---
**Author:** ![equality2112](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@equality2112](https://forum.lulzbot.com/u/equality2112)\ **Post date:** [October 13, 2023, 6:25pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/4 "2023-10-13T18:25:47Z")
Right now the printer is showing as “not connected” on my PC where i have Cura installed. ---
**Author:** ![equality2112](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@equality2112](https://forum.lulzbot.com/u/equality2112)\ **Post date:** [October 13, 2023, 6:26pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/5 "2023-10-13T18:26:27Z")
How do you power cycle a Lulzbot? I already turned it off and unplugged it. Now it showing it’s not connected to the my PC. ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [October 13, 2023, 6:27pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/6 "2023-10-13T18:27:00Z")
Cura sometimes has to be restarted as well if you restart the printer. ---
**Author:** ![equality2112](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@equality2112](https://forum.lulzbot.com/u/equality2112)\ **Post date:** [October 13, 2023, 6:40pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/7 "2023-10-13T18:40:26Z")
Already tried that. I am at a point where I am having our IT crew switch out the PC and reinstall CURA. ---
**Author:** ![Wrathernaut](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/wrathernaut/32/13542_2.png) [@Wrathernaut](https://forum.lulzbot.com/u/Wrathernaut)\ **Post date:** [October 13, 2023, 8:32pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/8 "2023-10-13T20:32:08Z")
Manually setting the com port may help as well ---
**Author:** ![equality2112](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@equality2112](https://forum.lulzbot.com/u/equality2112)\ **Post date:** [October 16, 2023, 10:35pm UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/9 "2023-10-16T22:35:47Z")
Thanks, it worked. Needed to actually replace the PC itself becuase the connection was faulty. Re-Flash the firmware. LED works now. However i am still getting an Autolevel failure. See here: [iCloud](https://share.icloud.com/photos/0e6JDaRyLscUl_SEdrQM4lWOQ) ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [October 17, 2023, 2:51am UTC](https://forum.lulzbot.com/t/bed-level-failure-taz-pro-led-blank-after-firmware-flash/26058/10 "2023-10-17T02:51:03Z")
That looks to be run of the mill dirty nozzle causing your failures. Heat the nozzle to like 250 and really scrub it with something. I like to use the tweezers that come with the printers to pry away any stubborn plastic near the very tip. Then turn the nozzle to 0 and while it’s cooling down clean it a few more times. There’s a red abrasive pad that comes with the printers you can try, but that’s a last resort as it can wear down the nozzle.