K1 Max fails to downgrade or update Firmware for CFS-C

[theDogger218]

The OWM White USB drive only show USB Inserted when trying to update the Firmware....So I tried from SSH

Trying to downgrade from 2.3.5.34 get this error
+++++++++++++++++++++++++++++++++++++++
CR4CU220812S11_ota_img_V1.3.0.39.img
+++++++++++++++++++++++++++++++++++++++
`login as: root
root@10.10.0.7's password:
root@K1Max-3CE8 /root [#] /etc/ota_bin/local_ota_update.sh /tmp/udisk/sda1/*.img

7-Zip 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=C,Utf16=off,HugeFiles=on,32 bits,2 CPUs LE)

Scanning the drive for archives:
1 file, 105550874 bytes (101 MiB)

Extracting archive: /usr/data/creality/ota_updater.XhW3zjT/CR4CU220812S11_ota_img_V1.3.0.39.img

Path = /usr/data/creality/ota_updater.XhW3zjT/CR4CU220812S11_ota_img_V1.3.0.39.img
Type = 7z
Physical Size = 105550874
Headers Size = 3162
Method = LZMA2:24 7zAES
Solid = +
Blocks = 1

Everything is Ok

Folders: 2
Files: 109
Size: 106623506
Compressed: 105550874
ota_current_version: 1.3.0.39
current_version: 2.3.5.34
ota_major < cur_major && ota_major < 2.
ota: stoped version_is_new
`
++++++++++++++++++++++++++++++++++++++++++
If I try and upgrade to the firmware copied off the Creality website I get this error
++++++++++++++++++++++++++++++++++++++++++
CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225.img
++++++++++++++++++++++++++++++++++++++++++
root@K1Max-3CE8 /root [#] /etc/ota_bin/local_ota_update.sh /tmp/udisk/sda1/*.img

7-Zip 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=C,Utf16=off,HugeFiles=on,32 bits,2 CPUs LE)

Scanning the drive for archives:
1 file, 175977576 bytes (168 MiB)

Extracting archive: /usr/data/creality/ota_updater.XKVhuel/CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225.img

ERRORS:
There are data after the end of archive

--
Path = /usr/data/creality/ota_updater.XKVhuel/CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225.img
Type = gzip
ERRORS:
There are data after the end of archive
Offset = 726680
Physical Size = 7466739
Tail Size = 167784157
Headers Size = 22
Streams = 1

ERROR: There are some data after the end of the payload data : vmlinux.bin

Sub items Errors: 1

Archives with Errors: 1

Open Errors: 1

Sub items Errors: 1
cp: can't stat '/usr/data/creality/ota_updater.XKVhuel/CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225/ota_config.in': No such file or directory
failed to get /usr/data/creality/ota_updater.XKVhuel/CR4CU220812S12_ota_X2000E_V1.1.0.27.20251225/ota_config.in
ota: error

Any thoughts? Creality support is a SLOWWWW!

[theDogger218]

Is there some cmd line switch that can be run to force it to upgrade if its older?

Command run

/etc/ota_bin/local_ota_update.sh /tmp/udisk/sda1/*.img

Folders: 2
Files: 109
Size: 106623506
Compressed: 105550874
ota_current_version: 1.3.0.39
current_version: 2.3.5.34
ota_major < cur_major && ota_major < 2.
ota: stoped version_is_new <<<<<<<------------------Will not upgrade due to be new version on the K1 Max

[ednba]

Were you able to downgrade? I'm having the same problem.

[philtj1957]

Since I installed the cfs-c on my k1 max s12 motherboard, I also have a big problem with auto leveling. The previous update seems impossible because the firmware offered corresponds to s11 motherboards.
I don't know what we can do and Creality service turns a deaf ear and sends me back to the supplier of my K1 Max purchased in January 2024. I am very disappointed with Creality which I used since CR10 and onwards.

[ednba]

Were you able to downgrade? I'm having the same problem.

[theDogger218]

Yes was able to downgrade after modifying a script that kept ignoring the older firmware.....was a total pain in the ass and Creality support was not help Keep in mind that with the CFS-C you loose the ablilty to root, connect via the UI from the Browser via IP and also bed leveling

…

-B

On Fri, Apr 10, 2026 at 5:30 AM ednba ***@***.***> wrote: Were you able to downgrade? I'm having the same problem. — Reply to this email directly, view it on GitHub <#877 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B6V3X5MRNHGUPDCCGBHHAOT4VDSPBAVCNFSM6AAAAACV3AYKW6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTMNJRG43DIMA> . You are receiving this because you authored the thread.Message ID: <Guilouz/Creality-Helper-Script-Wiki/repo-discussions/877/comments/16517640 @github.com>

[ednba]

Do you remember or have a step-by-step guide on how to bypass the old firmware? Because I tried using GPT and it didn't work.

[theDogger218]

What are the steps you are following to try and down grade? What is the error that you are getting?

…

On Fri, Apr 10, 2026 at 8:58 AM ednba ***@***.***> wrote: Do you remember or have a step-by-step guide on how to bypass the old firmware? Because I tried using GPT and it didn't work. — Reply to this email directly, view it on GitHub <#877 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B6V3X5OLQ2CFJSFMRIRRSZT4VEK3DAVCNFSM6AAAAACV3AYKW6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTMNJSGAYDCMY> . You are receiving this because you authored the thread.Message ID: <Guilouz/Creality-Helper-Script-Wiki/repo-discussions/877/comments/16520013 @github.com>

[ednba]

24 hours trying to find a way to force a downgrade.
[Tutorial] How to Force Downgrade Creality K1 / K1 Max via SSH
If you updated your K1/K1 Max and can't downgrade because the printer says "version is new" or fails via UI, follow these steps to bypass the security check.

Prerequisites:

FAT32 USB drive with the desired firmware .img file.

SSH access enabled.

Step-by-Step:

Clear modifications and enable Write access:

Bash
rm -rf /overlay/upper/*
mount -o remount,rw /
Create a "hacked" update script:
(We copy the original to a temp folder and bypass the version check exit)

Bash
cp /etc/ota_bin/local_ota_update.sh /tmp/local_ota_update_forced.sh
sed -i 's/exit 1/echo "Ignoring lock..."/g' /tmp/local_ota_update_forced.sh
chmod +x /tmp/local_ota_update_forced.sh
Run the forced downgrade:
(Make sure the .img filename matches the one on your USB drive)

Bash
/tmp/local_ota_update_forced.sh /tmp/udisk/sda1/YOUR_FILE_NAME_HERE.img
Wait: Once you see ota: stoped success, the printer will reboot into the downgraded firmware.

[theDogger218]

This is what I did...its posted in revese order just look at the line nuimbers https://www.reddit.com/r/crealityk1/comments/1ra821z/k1_max_and_issues_with_fireware_to_istall_for_cfsc/ https://guilouz.github.io/Creality-Helper-Script-Wiki/firmwares/restore-previous-firmware-k1/

…

On Fri, Apr 10, 2026 at 12:23 PM ednba ***@***.***> wrote: 24 hours trying to find a way to force a downgrade. [Tutorial] How to Force Downgrade Creality K1 / K1 Max via SSH If you updated your K1/K1 Max and can't downgrade because the printer says "version is new" or fails via UI, follow these steps to bypass the security check. Prerequisites: FAT32 USB drive with the desired firmware .img file. SSH access enabled. Step-by-Step: Clear modifications and enable Write access: Bash rm -rf /overlay/upper/* mount -o remount,rw / Create a "hacked" update script: (We copy the original to a temp folder and bypass the version check exit) Bash cp /etc/ota_bin/local_ota_update.sh /tmp/local_ota_update_forced.sh sed -i 's/exit 1/echo "Ignoring lock..."/g' /tmp/local_ota_update_forced.sh chmod +x /tmp/local_ota_update_forced.sh Run the forced downgrade: (Make sure the .img filename matches the one on your USB drive) Bash /tmp/local_ota_update_forced.sh /tmp/udisk/sda1/YOUR_FILE_NAME_HERE.img Wait: Once you see ota: stoped success, the printer will reboot into the downgraded firmware. — Reply to this email directly, view it on GitHub <#877 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/B6V3X5LT3L3DZECIRITGLVD4VFC4BAVCNFSM6AAAAACV3AYKW6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTMNJSGE3TQMA> . You are receiving this because you authored the thread.Message ID: <Guilouz/Creality-Helper-Script-Wiki/repo-discussions/877/comments/16521780 @github.com>