3rd option, take the working display from the new phone, and put it into the old phone for a while, take backups, and then switch display back to new unit.
mf@mf-desktop:~/Downloads$ sudo flashe--load -k vmlinuz-2.6.32.20112201-11.2-adaptation-n950-bootloader -n initrd.img-rescue-2.6.32.20112201-11.2-n950 --boot flasher 3.12.1 (Oct 5 2011) Harmattan WARNING: This tool is intended for professional use only. Using it may result in permanently damaging your device or losing the warranty. Suitable USB interface (bootloader/phonet) not found, waiting... USB device found at bus 001, device address 014. Device identifier: 357923040135321 (SN: N/A) Found device RM-696, hardware revision 1507 NOLO version 2.3.6 Version of 'sw-release': DFL61_HARMATTAN_40.2012.21-3_PR_006 Sending kernel image (2497 kB)... 100% (2497 of 2497 kB, avg. 26858 kB/s) Sending initfs image (1920 kB)... 100% (1920 of 1920 kB, avg. 30000 kB/s) Success mf@mf-desktop:~/Downloads$