I’ve found a solution - simply rename the bin file on the SD card something different from the Sovol naming structure (e.g., don’t use SV05_V1211 or SV05_122). After renaming the file the update completed and the modified SV05 FW w/Octoprint communication enhanced is working.
Sovol - may I suggest that you make this a standard feature in your SV05 FW? Can’t see any reason why this feature isn’t enabled in your FW for your customers.
Thanks!