**[HELP] K1C with CR4CU220812S12 board stuck on CFS firmware - need S12 ota_file binary**

Flagship K Series Creality Flagship K1 & K1C
1

Hi all,

I have a K1C with a CR4CU220812S12 mainboard (the newer X2000E SoC variant) that came with the CFS upgrade kit. The CFS firmware installed is 2.3.5.34 (S11-era), and it’s causing sensorless homing instability — random bashing into the frame and mid-print position losses.

I’ve been trying to flash the correct S12 firmware: CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225.img

The problem: the S12 firmware uses a different archive format (gzip/proprietary) than the old S11-era /usr/bin/ota_file binary on my printer can’t unpack. Even with the version check in local_ota_update.sh commented out, flashing fails because ota_file only extracts vmlinux.bin and misses the rest of the package.

What I need: the /usr/bin/ota_file binary from a printer running CR4CU220812S12 + firmware V1.1.0.27. It’s only 8.5KB.

If you have a K1, K1C, or K1 Max with the S12 board running V1.1.0.27, could you SSH in and share the file?

scp root@<your-printer-ip>:/usr/bin/ota_file ./ota_file_s12

Then share ota_file_s12 here or via DM. This would unblock a lot of S12 users who are stuck in the same situation.

Thanks in advance!

2 
Hello,
I recently replaced the motherboard on my K1C printer. The new board has firmware 1.3.3.46 installed, which is for the S11 series. However, I can't install any firmware for the S12 boards from here. Since I also have CFS, I'm wondering if you've found a way to update the firmware.
CR4CU220812S12_ota_X2000E_V1.1.0.27.20260428.img
Thank you and have a nice day.
3

Please share the file here so the rest of us stuck in this mess can get a fix as well. I’m stuck in the same boat. Just got a replacement board. Clearly S12 with X2000E but with S11 firmware flashed on it. Can’t get it to work with CFS-C because of this.

I have an open support ticket. I’ve flagged Creality support to this issue.

4

Sadly, Creality support sent me down a path to flash to the older S11 Firmware, so I still don’t have a way to get the S12 Firmware working. I continue to explore options. Have you found a path?

5

Sadly, Creality support sent me down a path to flash to the older S11 Firmware, so I still don’t have a way to get the S12 Firmware. I continue to explore options. Have you found a path?