For the 50,0000th time.. SIGNING THE BACKUP MANAGER WILL NOT MAKE IT WORK !!!!
The Manager will open but will be unable to load any game ! The required syscalls for running backups were injected into the PS3 memory during runtime by the jailbreak chip. This obviously won't happen now... ALSO , currently injecting the code is not feasible because along with NPDRM , there just isn't enough memory to hold it.
The solution is to patch the kernel or enable on the fly patching either of which is not possible currently. No , we CANNOT patch lv2 yet and so enabling those syscalls *right now* is unfeasible.
Now please... don't ask me to explain again that signing the Backup Manager will not work.