Hi, I have a similar problem.
I purchased a K1C printer on 29. 9. 2025 from the Czech e-shop https://www.3djake.cz/. The printer worked reliably and correctly. I purchased the additional CFS-C module on 15. 3. 20:55 from the Czech e-shop www.alza.cz. I followed the instructions step by step, but the printer shows errors and printing is not possible.
For general debugging and troubleshooting, I tried resetting to factory settings, ungind creality cloud, restarting the printer, restarting wifi, firmware update, removing cfs and re-mounting cfs, but none of the procedures fixed the error.
The primary problems are that the printer spends a long time connecting to wifi, or does not connect at all. The second problem is that after connecting to wifi I see it in the creality cloud as online in devices, but when I slice the model and want to select a printer from the list, it doesn’t see mine in the list of available devices. I also tried printing using Creality prinz from a PC. There the model is sent to the printer, but when it starts printing, you can see that the extrude doesn’t work (it doesn’t push out the filament) and the print is paused on layer 1 with the error F00528.
If I send the sliced model to the printer and start printing from the printer display, it works correctly.
During printing, the CFS-C model is displayed in the creality cloud alternately as connected and alternately as “Not inserted”. The camera doesn’t work at all.
Current firmware read from the printer display:
K1C_CFS-C Firmware V1.1.0.27.20251225
CFS-C 1 Firmware V1.0.0.27.20251225
I also tried the previous firmware included on the flash drive:
K1C_CFS-C Firmware V1.1.0.26.20251113
CFS-C 1 Firmware V1.1.0.26.20251113
Checking the current firmware shows “Up to date”.
Can you advise me where the error is? This is not a functional solution, which is why I chose the Creality K1C + CFS. I want to print from the cloud, but this printer does not appear in the available devices to start printing.
Users on the forum indicate that there was a hw change unrelated to the firmware and this is now causing errors, or new PCBs are being sent.
1)
https://www.reddit.com/r/Creality/comments/1jqnr7m/k1c_cfs_upgrade_kit_firmware/
Thank you for your answer and help. kopecnydavid5[symbol]gmail.com