Went to update the firmware on k1 for CFS upgrade using USB drive that came with the upgrade kit and it says that the iso image for the upgrade is corrupt.
CR4CU220812s11_ota_img_V2.3.5.33
The version of firmware on my K1C is 2.3.5.27 and when I check it says that is the latest version.
I had the same problem. Here is how I fixed it: It was pretty easy. You just move the CR4CU220812s11_ota_img_V2.3.5.33 into the USB itself (not inside the folder), then plug it in, and voila. The Pop-up should appear.
Your Welcome
Thanks for the given solution. It was indeed the issue that the file was not located in the root folder
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I got the CFS upgrade for my K1 Max. Having the issue where the popup does not appear to upgrade firmware when I insert the given usb. I have moved it to root folder still doesnt read it. Moved other files off leaving only the firmware on the usb. Nothing. Replaced firmware on usb with version from wiki.creality. Nothing. Formatted the usb and moved firmware back on usb. Nothing. Tried a different usb. You gessed it…NOTHING!