Technically possible yes, as mentioned the boot code came out in a previous update 00.04.00.00.00. I have a feeling that the issue is if you update the software before the boot code it won't allow you to apply the boot code.
Anyway I called it, but we won't be sure until Rigol gives specifics or we see a new update with a boot code file released.
If someone is in communication with them, tell Rigol to either en-corporate the boot code again with an updated version number, fix their update system or allow people to roll back properly. The firmware is all over the place and they have customers that can't even fix their bugs because of no confidence in the firmware update process.