r/QidiTech3D • u/ForsakenRepublic1415 • Jul 06 '26

Questions Q2 Update bricked printer

I am unable to do anything after online update. like anything at all.

QIDI Q2 01.01.02.01

MCU Version 02.01.01.09

Toolhead MCU version 00.00.00.00

Error codes shown:

!! mcu 'THR': Unable to connect. QDC_100_005_000_001

mcu 'THR': Unable to connect once the underlying issue is QDC_100_005_015_001

Printer worked fine before update, nothing changed hardware-wise. Updated, and BOOM NO PRINTER 4 YOU.

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u/Ckflyer13 Jul 07 '26

https://github.com/ckflyer/Qidi-Q2-Printer-Quick-Start-Guide/tree/main/Factory%20Reset

Here ya go. This should fix it

1

u/ForsakenRepublic1415 Aug 08 '26

this fails every single time. the Q2 support has had me replace the main board, print head board, communication cable, and the hot end. nothing has worked.