Please read the first post of the thread I linked. It explains everything. There are lots of variants of pr 1.3, you just have to find the right one for your phone.

This is what happened just now when I tried to flash the firmware:

sudo flasher -f -F main.bin
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.

USB device found at bus 001, device address 018.
Device identifier: 357923044413773 (SN: N/A)
Raw data transfer EP found at EP2.
Ping attempt 1 (250 ms)
Server application: 1.7.2
Found product RM-696 rev. 1603
Server implements softupd protocol version 1.8
Image SW version DFL61_HARMATTAN_40.2012.21-3_PR_001
Image moslo not present
Image mmc not present
Image tar skipped
Image config skipped

Battery level 45 %, continuing.

image [state progress transfer flash speed]
---------------------------------------------------------------------
[_] cert-sw [init 0 % 0 / 0 kB NA ]
[ ] cmt-2nd [pending 0 % 0 / 0 kB NA ]
[ ] cmt-algo [pending 0 % 0 / 0 kB NA ]
[ ] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
[ ] xloader [pending 0 % 0 / 0 kB NA ]
[ ] secondary [pending 0 % 0 / 0 kB NA ]
[ ] kernel [pending 0 % 0 / 0 kB NA ]
[ ] rootfs [pending 0 % 0 / 0 kB NA ]
ERROR: SU_GET_UPDATE_STATUS_REQ terminated with error code 10: Security failure

image [state progress transfer flash speed]
---------------------------------------------------------------------
[f] cert-sw [init 0 % 1 / 1 kB NA ]
[ ] cmt-2nd [pending 0 % 0 / 0 kB NA ]
[ ] cmt-algo [pending 0 % 0 / 0 kB NA ]
[ ] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
[ ] xloader [pending 0 % 0 / 0 kB NA ]
[ ] secondary [pending 0 % 0 / 0 kB NA ]
[ ] kernel [pending 0 % 0 / 0 kB NA ]
[ ] rootfs [pending 0 % 0 / 0 kB NA ]
Fetching error list:
========================================
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
Downgrade disallowed (1352745255)
[Pipe 0] Finishing in error state with status 10
========================================

ERROR: Failed to flash images


Do you know why this keeps happening? This is the newest version right?

Flashing finally worked! I used a wrong version after all. Thanks for helping me out.

What was the right version?