you maybe could install it, i'm not sure i only tested it on 3.55 but it was based on a 4.10 official firmware with kiosk 4.10 dev_flash built with PS3MFW builder i'm not sure how it packs the pups if it signs them for 3.55 then it definitely won't work and would say corrupt data.
however if it does work then you will be stuck on this custom firmware in kiosk mode which will be ok as long as you didn't update to 4.11 or next update that gets released it would be best to wait for me to re-pack a new pup that would put your console back into retail mode. if you get me?
This works differently to the usb XML loading system used in my 4.00HFW v3. It instead uses the system implemented for development use of the XMBM+ v0.10 (USB loading was not an intended for public release). It supports loading from dev_usb000, dev_usb001 and dev_usb006 (these were the decided set of supported USB ports). So here are some instructions on how to use it:
Install technodon's pup patched for usb loading.
Download the XMBM+ v0.10 (linked above) and extract the contents to the root of the usb drive.
Plug in the USB drive in one of the USB ports listed above, this should cover most of the slim and fat models' USB ports. If you are not sure what usb ports your PS3 uses, just use the right most one as that is dev_usb000 on every PS3 model.
Keep the USB drive plugged in at all times, as the XMB will call upon the USB for resources like images and other XML files.
Note: Switching USB ports while the PS3 is at the XMB will break the XMBM+ causing sub-items and images not to show. This is because when the XMB initially loads the game_main.xml to the ram, it uses a specific part of that xml file depending on which port the USB drive is plugged in. So it knows which usb device to search when requiring other xml files or images.
You may ask, why not have it search every USB device in every XML file so the is no compatiblity problems. You can do this but, having the XMB search for content on every possible USB port slows down the loading time of the XMB dramatically. Having the XMB search only 3 devices once has no noticeable affect on the XMB loading time.
FYI this version of the XMBM+ is same version I have made in preparation for my 4.10HFW release.