In case you can not do a factory reset you will have to do a search in the networks or direct support of the manufacturer to be able to obtain the SYSEX file that corresponds to the programming banks of the device, via MIDI the dump is done towards the same (you should have backed it up before putting a new battery). Check if it can be reset to factory state with the manual, banks are probably recorded in ROM (some devices do not have this resource).
Page 36 of the manual.
Quad4_original.pdf [570.35kb]