I have downloaded and installed CR4CU220812S11_ota_img_V2.3.5.34.img on my K1 printer. Now, I am unable to print due to notifications about missing filament. I have tried to change a name of monochrome firmwares to CR4CU220812S11_ota_img_V2.3.5.35.img CR4CU220812S11_ota_img_V3.3.5.34.img but at some point the upgrate returns an error.
My printer is unusable. Any solutions?
I hope this helps
No, It doesn’t. I have tried to install previous versions of the firmware. Each time I’ve got a message “…. installation failure”. I tried as well a name change, to increment it’s sem version number, to trigger an install process, but without success. Exampel: CR4CU220812S11_ota_img_V2.3.5.34 → CR4CU220812S11_ota_img_V2.3.5.35
CR4CU220812S11_ota_img_V1.2.9.12 → CR4CU220812S11_ota_img_V2.3.5.35
Dang ok. Let me check somewhere else
Were you able to downgrade? I’m having the same problem.
24 hours trying to find a way to force a downgrade.
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.
thanks you so much <3 this worked for me <3
I have attempted the changes mentioned above without success. I consistently get an error saying the file is not valid though I have triple checked it is the correct file name for the img file. I even renamed the file to remove the “.”s in the firmware version number…no difference in outcome. Is the any other ways to force a downgrade to the firmware from multicolor to monochrome? I mistakenly updated the firmware to V2.3.5.34 and want to go to V1.3.5.19.
had same problem , no filament ?!? , even filament was present , but I could not upgrade downgrade to any other version , but instruction works
#] /tmp/lokal_force.sh /tmp/udisk/sda1/old/CR4CU220812S11_ota_img_V1.3.3.46.img
ls: /usr/data/creality/ota_updater*: No such file or directory
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, 135906314 bytes (130 MiB)
Path = /usr/data/creality/ota_updater.XKaLMjv/CR4CU220812S11_ota_img_V1.3.3.46.img
Type = 7z
Physical Size = 135906314
Headers Size = 3866
Method = LZMA2:24 7zAES
Solid = +
Blocks = 1
Everything is Ok
Folders: 2
Files: 138
Size: 137483751
Compressed: 135906314
ota_current_version: 1.3.3.46
current_version: 2.3.5.34
ota_major < cur_major && ota_major < 2.
ota: stoped version_is_new
Ignoring lock…
ota_kernel 1
ota_kernel_name xImage
ota_kernel_size 4083776
ota_kernel_md5 25ccf5ce8b4ea2fa605971641e085fb5
ota_rootfs 1
ota_rootfs_name rootfs.squashfs
ota_rootfs_size 132882432
ota_rootfs_md5 ca0681b3ace033a8fe7d23fdde359252
ota_rtos 1
ota_rtos_name zero.bin
ota_rtos_size 512856
ota_rtos_md5 9ad434c7a70a61957b5e72dd4597259d
256+0 records in
256+0 records out
256+0 records in
256+0 records out
256+0 records in
256+0 records out
we are going to ota update
ota: started
start update kernel
ota: data processed: 0% 1048576 137479064
ota: data processed: 1% 2097152 137479064
ota: data processed: 2% 3145728 137479064
xImage read ok, now quit
ota: data processed: 2% 4083776 137479064
kernel update done
start update rootfs
ota: data processed: 3% 1048576 137479064
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rootfs.squashfs read ok, now quit
ota: data processed: 99% 132882432 137479064
rootfs update done
start update rtos
zero.bin read ok, now quit
ota: data processed: 100% 512856 137479064
rtos update done
ota update ok
256+0 records in
256+0 records out
ota: stoped success
root@K1
@
eduardonbanba 
This helped me. Thanks!